四年級數(shù)學(xué)下冊全冊教案_第3單元 運(yùn)算定律與簡便計算

BLINDBOARDOPERATIONALSECURITYREQUIREMENTS1BLOCKINGBLINDBOARDOPERATIONSREQUIREDTOHANDLEBLOCKINGBLINDBOARDOPERATINGLICENSE,NOBLOCKINGBLINDBOARDOPERATINGLICENSEARENOTALLOWEDTOSMOKEBLOCKINGBLINDBOARDOPERATIONS2ITISSTRICTLYPROHIBITEDTOALTER,LENTTHEBLOCKINGBLINDBOARDOPERATINGLICENSECONTENTCONVERSIONANDEXPANSIONOFOPERATIONSORTRANSFERJOBSSITE,AGAINFORBLOCKINGBLINDBOARDOPERATINGLICENSE3INCOMPLETEJOBAPPROVALPROCEDURES,SAFETYMEASURESARENOTIMPLEMENTED,WORKENVIRONMENTDOESNOTMEETSECURITYREQUIREMENTS,WORKERSHAVETHERIGHTTOREFUSETOWORK4TOXICGASPIPING,EQUIPMENTBLOCKINGBLINDBOARD,NONIRRITANTGASPRESSURESHOULDBELESSTHAN200MMHGIRRITANTGASPRESSURESHOULDBELESSTHAN50MMHGGASTEMPERATURESHOULDBELESSTHAN60DEGREES5TECHNICALDEPARTMENTRESPONSIBLEFORDRAWINGBLINDLOCATIONMAP,NUMBERSTHEBLIND,CONSTRUCTIONPERSONNELWORK,BLINDLOCATIONMAPBYTECHNOLOGYARCHIVEFORFUTUREREFERENCE6THEBLINDPLUGOPERATINGPERSONNELMUSTWEARAPPROPRIATEPERSONALPROTECTIVEEQUIPMENT,MUSTDESIGNATEAPERSONRESPONSIBLEFORBLOCKINGBLINDBOARDWORK,ANDTODESIGNATEAPERSONRESPONSIBLEFORMONITORINGGUARDIANSAREADVISEDBYEXPERIENCEDOFFICERS,GUARDIANJOBSPEOPLEMUSTWEARAPPROPRIATEPROTECTIVEEQUIPMENTASREQUIRED,ANDGUARDIANSMUSTCHECK,IMPLEMENTINGRELEVANTSAFETYMEASURESONTHEJOBGUARDIANSMUSTADHERETOTHESCENE,ANDEMERGENCYTREATMENTJOBGUARDIANSHALLNOTLEAVETHEJOBSITEBEFORETHEEND7THEJOBCOMPLICATED,DANGEROUSPLACES,APARTFROMTHEGUARDIAN,ALSOCOMPANYLEADERSHIP,SAFETYANDENVIRONMENTDEPARTMENT,ISRESPONSIBLEFORPERSONNELINVOLVINGTHEENTIREPRODUCTIONSYSTEM,HEADOFTHETECHNICALDEPARTMENTMUSTBEPRESENT8INPLACESWHEREINFLAMMABLEANDEXPLOSIVEWORK,PLACEWITHIN30METRESWITHOUTHOTWORKOPERATIONSTASKLIGHTINGSHOULDUSEEXPLOSIONPROOFLAMPSANDEXPLOSIONPROOFTOOLSSHOULDBEUSED,PROHIBITIONOFBEATINGWITHANIRONPIPE,FLANGE,ETC9HIGHBLOCKINGBLINDBOARDOPERATIONSHALLFOLLOWTHEPROVISIONSOFLICENSEFORWORKINGATHEIGHT10CONSTRUCTIONUNITTOBLINDALOTACCORDINGTOTHEREQUIREMENTSOFTHEPERMITTOWORK,THEIMPLEMENTATIONOFSAFETYMEASURES,WORKCANBECARRIEDOUT11ISSTRICTLYPROHIBITEDONTHESAMEPIPESIMULTANEOUSLYINTWOPLACESANDTWOORMOREBLOCKINGBLINDBOARDOPERATIONSWHENPLUGGINGMULTIPLEBLIND,BLINDTOBLINDLOCATIONMAPANDPLATESNUMBERBYCONSTRUCTIONGENERALMANAGER,UNITYOFCOMMANDASSIGNMENTS12SIGNSINEACHBLOCKINGBLINDBOARDSHOWSTHATBLINDLOCATIONCTHEBLOCKINGBLINDBOARDPERMITSTHEMANAGEMENTOF1BLINDLOCATIONMAP,IMPLEMENTSECURITYMEASURES,AFTERTHEAPPROVALOFTHETECHNICALDEPARTMENT,ASSIGNMENTUNITSSTAFFTOCONFIRMJOBCOMPLEX,DANGEROUSPLACESREQUIREDSECURITYAUDITSOFTHEDEPARTMENTOFENVIRONMENTALPROTECTION,THECOMPANYINCHARGEOFSAFETYVICEPRESIDENTFORAPPROVAL4APPROVEAGOODBLOCKINGBLINDBOARDOPERATINGLICENSEINTRIPLICATE,MAINCONTRACTORS,OPERATINGUNITS,EACHHOLDACOPYOFTHEBIOSECTION5AFTERTHEENDOFTHEJOB,JOBS,TECHNICALCHECK,ACTIVITYHANDEDTHEBLINDLOCATIONTECHNOLOGY6WORKPERMITSMANAGEMENTSHOULDESTABLISHTHETICKETFILEINVENTORY,THETICKETISKEPTFOR3YEARSTHELIFTINGOPERATIONMANAGEMENTSYSTEM,PURPOSEINORDERTOCONTROLTHEPRODUCTIONWITHINTHEREGION,LIFTING,LIFTINGACTIVITIESTOPREVENTTHEOCCURRENCEOFACCIDENTS,THESYSTEMISFORMULATEDSECOND,THESCOPEOFAPPLICATIONOFTHISSYSTEMAPPLIESTOALLCOMPANIESWITHINTHELIFTINGOPERATIONTHIRD,LIFTINGALICENSEOFGRADEDCREDITTHREELEVELSOFMANAGEMENTIGENERALEQUIPMENT,WEIGHINGLESSTHAN1TONOFWEIGHTLIFTING,THELIFTINGOFTHERULES,TECHNOLOGYREVIEW,WORKSHOPDIRECTORFORAPPROVALBTHERULESOFWEIGHTEQUALTOORGREATERTHAN1TONLESSTHAN10TONSOFWEIGHTLIFTING,HOISTING,APPROVEDBYTHEWORKSHOP,EQUIPMENTMANAGEMENTDEPARTMENTFORAPPROVALCOFOVER10TONSANDHEAVYLIFTINGOPERATIONSPROJECTSORCONSTRUCTIONUNDERTHESPECIALCONDITIONS,SHALLPREPARELIFTINGPLAN,PERMITTOWORKSUBMITTEDTOCOMPANYEXECUTIVESANDSAFETYEQUIPMENT,THEJOINTSECURITYSECTORREVIEWCOMPETENTAFTERASSISTANTGENERALMANAGERAPPROVALFOUR,LIFTINGSAFETYREQUIREMENTS1LIFTINGWEIGHTSGREATERTHANOREQUALTO10TONNESOFTHEOBJECTANDTHESUBJECTOFCIVILENGINEERINGSTRUCTURES,HOISTINGCONSTRUCTIONPLANSHALLBEPREPAREDLOADISLESSTHAN10TONNES,BUTSMALLCOMPLEXSHAPES,STIFFNESS,LENGTHDIAMETERRATIO,PRECISIONPRECIOUS,UNDERTHESPECIALCONDITIONSOFCONSTRUCTION,SHOULDALSOPREPARECONSTRUCTIONPROGRAMMESHOISTINGCONSTRUCTIONPROGRAMMESEXAMINEDBYTHEPROJECTAUTHORITIES,SUBMITTEDTOTHECOMPETENTVPAPPROVALTOBEIMPLEMENTED2LIFTINGOPERATIONSMUSTSETUPTHEALERTLINEANDSETUPSPECIALCARE,GUARDIANSHIPPERSONNELMUSTWEARARMBANDS,LIFTINGREGIONALSTAFFOUTOFBOUNDS3LIFTINGOPERATIONSMUSTBEPROVIDEDFORLIFTINGLOADS,SLINGS,RIGGINGANDECONOMICCALCULATIONOPTIONS,DONOTOVERLOADWHENLIFTINGHEAVYOBJECTSCLOSETOORREACHTHERATEDLIFTINGCAPACITY,CHECKBRAKES,LOWHEIGHT,SHORTSTROKEAFTERTHELOADTEST,THENSMOOTHLYLIFTEDLARGEANDMEDIUMSIZEDEQUIPMENTBEFORELIFTING,LOADTESTSHOULDBECARRIEDOUTTRYHANGINGHEIGHTFORABOUT02MANDTHENCONDUCTARELIABILITYCHECKINCLUDINGTHESELECTIONANDCALCULATIONOFSAFETYFACTOROVERLOADLIFTINGISSTRICTLYPROHIBITED4BEFORELIFTINGMUSTPADTHEWOODANDTHEWOODUSEDMUSTBEOFADEQUATESIZEBESURETOOVER1MWHENLIFTINGREQUIRESFIREESCAPE,YOUMUSTCONTACTTHECIRCUITBREAKERINACCORDANCEWITHTHEPROVISIONS5LIFTINGOPERATIONSMUSTBERUNONALLKINDSOFHOISTINGMACHINERYPARTS,SAFETYDEVICESASWELLASSLINGS,RIGGINGADETAILEDSECURITYCHECKS,SECURITYDEVICESFORLIFTINGEQUIPMENTISSENSITIVEANDRELIABLE,NOILLNESSMUSTTRYBEFORELIFTINGCRANE,CONFIRMEDBEFORETHEYCANWORK6LIFTINGOPERATIONS,REMOVEDPLATFORMGUARDRAILMUSTBERESTOREDTHEBOLTACTIVITYFENCEREMOVALISSTRICTLYPROHIBITED7LIFTINGOPERATIONS,SHOULDHAVEADEQUATELIGHTINGATNIGHT,OUTDOOR16,LIFTINGTHEAPPROVALPROCEDUREISNOTCOMPLETE,SECURITYMEASURESARENOT第三單元運(yùn)算定律與簡便計算加法交換律、加法結(jié)合律教學(xué)內(nèi)容P28/例1（加法交換律）P29/例2（加法結(jié)合律）教學(xué)目標(biāo)引導(dǎo)學(xué)生探究和理解加法交換律、結(jié)合律。培養(yǎng)學(xué)生根據(jù)具體情況，選擇算法的意識與能力，發(fā)展思維的靈活性。使學(xué)生感受數(shù)學(xué)與現(xiàn)實生活的聯(lián)系，能用所學(xué)知識解決簡單的實際問題。教學(xué)過程一、主題圖引入觀察主題圖，根據(jù)條件提出問題（1）李叔叔今天一共騎了多少千米（2）李叔叔三天一共騎了多少千米引導(dǎo)學(xué)生觀察主題圖教師根據(jù)學(xué)生提出的問題板書。二、新授練習(xí)本上用自己的方法列出綜合算式，解答黑板上問題。教師巡視，找出課堂上需要的答案，找學(xué)生板演。學(xué)生觀察第一組算式，發(fā)現(xiàn)特點(diǎn)。引導(dǎo)學(xué)生觀察第一組算式，總結(jié)出40565640試著再舉出幾個這樣的例子。根據(jù)學(xué)生的舉例，進(jìn)行板書。通過這幾組算式，你們發(fā)現(xiàn)了什么學(xué)生發(fā)現(xiàn)規(guī)律兩個加數(shù)交換位置，和不變。這叫做加法交換律。教師根據(jù)學(xué)生的小結(jié)，板書。你能用自己喜歡的方式表示出加法交換律嗎引導(dǎo)學(xué)生觀察第二組算式，總結(jié)出（8810496）88（10496）學(xué)生BLINDBOARDOPERATIONALSECURITYREQUIREMENTS1BLOCKINGBLINDBOARDOPERATIONSREQUIREDTOHANDLEBLOCKINGBLINDBOARDOPERATINGLICENSE,NOBLOCKINGBLINDBOARDOPERATINGLICENSEARENOTALLOWEDTOSMOKEBLOCKINGBLINDBOARDOPERATIONS2ITISSTRICTLYPROHIBITEDTOALTER,LENTTHEBLOCKINGBLINDBOARDOPERATINGLICENSECONTENTCONVERSIONANDEXPANSIONOFOPERATIONSORTRANSFERJOBSSITE,AGAINFORBLOCKINGBLINDBOARDOPERATINGLICENSE3INCOMPLETEJOBAPPROVALPROCEDURES,SAFETYMEASURESARENOTIMPLEMENTED,WORKENVIRONMENTDOESNOTMEETSECURITYREQUIREMENTS,WORKERSHAVETHERIGHTTOREFUSETOWORK4TOXICGASPIPING,EQUIPMENTBLOCKINGBLINDBOARD,NONIRRITANTGASPRESSURESHOULDBELESSTHAN200MMHGIRRITANTGASPRESSURESHOULDBELESSTHAN50MMHGGASTEMPERATURESHOULDBELESSTHAN60DEGREES5TECHNICALDEPARTMENTRESPONSIBLEFORDRAWINGBLINDLOCATIONMAP,NUMBERSTHEBLIND,CONSTRUCTIONPERSONNELWORK,BLINDLOCATIONMAPBYTECHNOLOGYARCHIVEFORFUTUREREFERENCE6THEBLINDPLUGOPERATINGPERSONNELMUSTWEARAPPROPRIATEPERSONALPROTECTIVEEQUIPMENT,MUSTDESIGNATEAPERSONRESPONSIBLEFORBLOCKINGBLINDBOARDWORK,ANDTODESIGNATEAPERSONRESPONSIBLEFORMONITORINGGUARDIANSAREADVISEDBYEXPERIENCEDOFFICERS,GUARDIANJOBSPEOPLEMUSTWEARAPPROPRIATEPROTECTIVEEQUIPMENTASREQUIRED,ANDGUARDIANSMUSTCHECK,IMPLEMENTINGRELEVANTSAFETYMEASURESONTHEJOBGUARDIANSMUSTADHERETOTHESCENE,ANDEMERGENCYTREATMENTJOBGUARDIANSHALLNOTLEAVETHEJOBSITEBEFORETHEEND7THEJOBCOMPLICATED,DANGEROUSPLACES,APARTFROMTHEGUARDIAN,ALSOCOMPANYLEADERSHIP,SAFETYANDENVIRONMENTDEPARTMENT,ISRESPONSIBLEFORPERSONNELINVOLVINGTHEENTIREPRODUCTIONSYSTEM,HEADOFTHETECHNICALDEPARTMENTMUSTBEPRESENT8INPLACESWHEREINFLAMMABLEANDEXPLOSIVEWORK,PLACEWITHIN30METRESWITHOUTHOTWORKOPERATIONSTASKLIGHTINGSHOULDUSEEXPLOSIONPROOFLAMPSANDEXPLOSIONPROOFTOOLSSHOULDBEUSED,PROHIBITIONOFBEATINGWITHANIRONPIPE,FLANGE,ETC9HIGHBLOCKINGBLINDBOARDOPERATIONSHALLFOLLOWTHEPROVISIONSOFLICENSEFORWORKINGATHEIGHT10CONSTRUCTIONUNITTOBLINDALOTACCORDINGTOTHEREQUIREMENTSOFTHEPERMITTOWORK,THEIMPLEMENTATIONOFSAFETYMEASURES,WORKCANBECARRIEDOUT11ISSTRICTLYPROHIBITEDONTHESAMEPIPESIMULTANEOUSLYINTWOPLACESANDTWOORMOREBLOCKINGBLINDBOARDOPERATIONSWHENPLUGGINGMULTIPLEBLIND,BLINDTOBLINDLOCATIONMAPANDPLATESNUMBERBYCONSTRUCTIONGENERALMANAGER,UNITYOFCOMMANDASSIGNMENTS12SIGNSINEACHBLOCKINGBLINDBOARDSHOWSTHATBLINDLOCATIONCTHEBLOCKINGBLINDBOARDPERMITSTHEMANAGEMENTOF1BLINDLOCATIONMAP,IMPLEMENTSECURITYMEASURES,AFTERTHEAPPROVALOFTHETECHNICALDEPARTMENT,ASSIGNMENTUNITSSTAFFTOCONFIRMJOBCOMPLEX,DANGEROUSPLACESREQUIREDSECURITYAUDITSOFTHEDEPARTMENTOFENVIRONMENTALPROTECTION,THECOMPANYINCHARGEOFSAFETYVICEPRESIDENTFORAPPROVAL4APPROVEAGOODBLOCKINGBLINDBOARDOPERATINGLICENSEINTRIPLICATE,MAINCONTRACTORS,OPERATINGUNITS,EACHHOLDACOPYOFTHEBIOSECTION5AFTERTHEENDOFTHEJOB,JOBS,TECHNICALCHECK,ACTIVITYHANDEDTHEBLINDLOCATIONTECHNOLOGY6WORKPERMITSMANAGEMENTSHOULDESTABLISHTHETICKETFILEINVENTORY,THETICKETISKEPTFOR3YEARSTHELIFTINGOPERATIONMANAGEMENTSYSTEM,PURPOSEINORDERTOCONTROLTHEPRODUCTIONWITHINTHEREGION,LIFTING,LIFTINGACTIVITIESTOPREVENTTHEOCCURRENCEOFACCIDENTS,THESYSTEMISFORMULATEDSECOND,THESCOPEOFAPPLICATIONOFTHISSYSTEMAPPLIESTOALLCOMPANIESWITHINTHELIFTINGOPERATIONTHIRD,LIFTINGALICENSEOFGRADEDCREDITTHREELEVELSOFMANAGEMENTIGENERALEQUIPMENT,WEIGHINGLESSTHAN1TONOFWEIGHTLIFTING,THELIFTINGOFTHERULES,TECHNOLOGYREVIEW,WORKSHOPDIRECTORFORAPPROVALBTHERULESOFWEIGHTEQUALTOORGREATERTHAN1TONLESSTHAN10TONSOFWEIGHTLIFTING,HOISTING,APPROVEDBYTHEWORKSHOP,EQUIPMENTMANAGEMENTDEPARTMENTFORAPPROVALCOFOVER10TONSANDHEAVYLIFTINGOPERATIONSPROJECTSORCONSTRUCTIONUNDERTHESPECIALCONDITIONS,SHALLPREPARELIFTINGPLAN,PERMITTOWORKSUBMITTEDTOCOMPANYEXECUTIVESANDSAFETYEQUIPMENT,THEJOINTSECURITYSECTORREVIEWCOMPETENTAFTERASSISTANTGENERALMANAGERAPPROVALFOUR,LIFTINGSAFETYREQUIREMENTS1LIFTINGWEIGHTSGREATERTHANOREQUALTO10TONNESOFTHEOBJECTANDTHESUBJECTOFCIVILENGINEERINGSTRUCTURES,HOISTINGCONSTRUCTIONPLANSHALLBEPREPAREDLOADISLESSTHAN10TONNES,BUTSMALLCOMPLEXSHAPES,STIFFNESS,LENGTHDIAMETERRATIO,PRECISIONPRECIOUS,UNDERTHESPECIALCONDITIONSOFCONSTRUCTION,SHOULDALSOPREPARECONSTRUCTIONPROGRAMMESHOISTINGCONSTRUCTIONPROGRAMMESEXAMINEDBYTHEPROJECTAUTHORITIES,SUBMITTEDTOTHECOMPETENTVPAPPROVALTOBEIMPLEMENTED2LIFTINGOPERATIONSMUSTSETUPTHEALERTLINEANDSETUPSPECIALCARE,GUARDIANSHIPPERSONNELMUSTWEARARMBANDS,LIFTINGREGIONALSTAFFOUTOFBOUNDS3LIFTINGOPERATIONSMUSTBEPROVIDEDFORLIFTINGLOADS,SLINGS,RIGGINGANDECONOMICCALCULATIONOPTIONS,DONOTOVERLOADWHENLIFTINGHEAVYOBJECTSCLOSETOORREACHTHERATEDLIFTINGCAPACITY,CHECKBRAKES,LOWHEIGHT,SHORTSTROKEAFTERTHELOADTEST,THENSMOOTHLYLIFTEDLARGEANDMEDIUMSIZEDEQUIPMENTBEFORELIFTING,LOADTESTSHOULDBECARRIEDOUTTRYHANGINGHEIGHTFORABOUT02MANDTHENCONDUCTARELIABILITYCHECKINCLUDINGTHESELECTIONANDCALCULATIONOFSAFETYFACTOROVERLOADLIFTINGISSTRICTLYPROHIBITED4BEFORELIFTINGMUSTPADTHEWOODANDTHEWOODUSEDMUSTBEOFADEQUATESIZEBESURETOOVER1MWHENLIFTINGREQUIRESFIREESCAPE,YOUMUSTCONTACTTHECIRCUITBREAKERINACCORDANCEWITHTHEPROVISIONS5LIFTINGOPERATIONSMUSTBERUNONALLKINDSOFHOISTINGMACHINERYPARTS,SAFETYDEVICESASWELLASSLINGS,RIGGINGADETAILEDSECURITYCHECKS,SECURITYDEVICESFORLIFTINGEQUIPMENTISSENSITIVEANDRELIABLE,NOILLNESSMUSTTRYBEFORELIFTINGCRANE,CONFIRMEDBEFORETHEYCANWORK6LIFTINGOPERATIONS,REMOVEDPLATFORMGUARDRAILMUSTBERESTOREDTHEBOLTACTIVITYFENCEREMOVALISSTRICTLYPROHIBITED7LIFTINGOPERATIONS,SHOULDHAVEADEQUATELIGHTINGATNIGHT,OUTDOOR16,LIFTINGTHEAPPROVALPROCEDUREISNOTCOMPLETE,SECURITYMEASURESARENOT觀察第二組算式，發(fā)現(xiàn)特點(diǎn)。學(xué)生繼續(xù)觀察幾組算式。出示（69172）28、69（17228）、155（145207）、（155145）207通過上面的幾組算式，你們發(fā)現(xiàn)了什么學(xué)生總結(jié)觀察到的規(guī)律。教師板書先把前兩個數(shù)相加，或者先把后兩個數(shù)相加，和不變。這叫做叫法結(jié)合律。學(xué)生用自己喜歡的方式表示加法結(jié)合律。學(xué)生根據(jù)這兩個運(yùn)算定律，舉一些生活中的例子。三、鞏固練習(xí)P28/做一做、P31/4、1四、小結(jié)學(xué)生小結(jié)本節(jié)課學(xué)習(xí)的加法的運(yùn)算定律。今天這節(jié)課你們都有什么收獲你能把這些運(yùn)用于以后的學(xué)習(xí)中嗎五、作業(yè)P31/3板書設(shè)計加法的運(yùn)算定律（1）李叔叔今天一共騎了多少千米（2）李叔叔三天一共騎了多少千米405696（千米）564096（千米）881049610496881929620088BLINDBOARDOPERATIONALSECURITYREQUIREMENTS1BLOCKINGBLINDBOARDOPERATIONSREQUIREDTOHANDLEBLOCKINGBLINDBOARDOPERATINGLICENSE,NOBLOCKINGBLINDBOARDOPERATINGLICENSEARENOTALLOWEDTOSMOKEBLOCKINGBLINDBOARDOPERATIONS2ITISSTRICTLYPROHIBITEDTOALTER,LENTTHEBLOCKINGBLINDBOARDOPERATINGLICENSECONTENTCONVERSIONANDEXPANSIONOFOPERATIONSORTRANSFERJOBSSITE,AGAINFORBLOCKINGBLINDBOARDOPERATINGLICENSE3INCOMPLETEJOBAPPROVALPROCEDURES,SAFETYMEASURESARENOTIMPLEMENTED,WORKENVIRONMENTDOESNOTMEETSECURITYREQUIREMENTS,WORKERSHAVETHERIGHTTOREFUSETOWORK4TOXICGASPIPING,EQUIPMENTBLOCKINGBLINDBOARD,NONIRRITANTGASPRESSURESHOULDBELESSTHAN200MMHGIRRITANTGASPRESSURESHOULDBELESSTHAN50MMHGGASTEMPERATURESHOULDBELESSTHAN60DEGREES5TECHNICALDEPARTMENTRESPONSIBLEFORDRAWINGBLINDLOCATIONMAP,NUMBERSTHEBLIND,CONSTRUCTIONPERSONNELWORK,BLINDLOCATIONMAPBYTECHNOLOGYARCHIVEFORFUTUREREFERENCE6THEBLINDPLUGOPERATINGPERSONNELMUSTWEARAPPROPRIATEPERSONALPROTECTIVEEQUIPMENT,MUSTDESIGNATEAPERSONRESPONSIBLEFORBLOCKINGBLINDBOARDWORK,ANDTODESIGNATEAPERSONRESPONSIBLEFORMONITORINGGUARDIANSAREADVISEDBYEXPERIENCEDOFFICERS,GUARDIANJOBSPEOPLEMUSTWEARAPPROPRIATEPROTECTIVEEQUIPMENTASREQUIRED,ANDGUARDIANSMUSTCHECK,IMPLEMENTINGRELEVANTSAFETYMEASURESONTHEJOBGUARDIANSMUSTADHERETOTHESCENE,ANDEMERGENCYTREATMENTJOBGUARDIANSHALLNOTLEAVETHEJOBSITEBEFORETHEEND7THEJOBCOMPLICATED,DANGEROUSPLACES,APARTFROMTHEGUARDIAN,ALSOCOMPANYLEADERSHIP,SAFETYANDENVIRONMENTDEPARTMENT,ISRESPONSIBLEFORPERSONNELINVOLVINGTHEENTIREPRODUCTIONSYSTEM,HEADOFTHETECHNICALDEPARTMENTMUSTBEPRESENT8INPLACESWHEREINFLAMMABLEANDEXPLOSIVEWORK,PLACEWITHIN30METRESWITHOUTHOTWORKOPERATIONSTASKLIGHTINGSHOULDUSEEXPLOSIONPROOFLAMPSANDEXPLOSIONPROOFTOOLSSHOULDBEUSED,PROHIBITIONOFBEATINGWITHANIRONPIPE,FLANGE,ETC9HIGHBLOCKINGBLINDBOARDOPERATIONSHALLFOLLOWTHEPROVISIONSOFLICENSEFORWORKINGATHEIGHT10CONSTRUCTIONUNITTOBLINDALOTACCORDINGTOTHEREQUIREMENTSOFTHEPERMITTOWORK,THEIMPLEMENTATIONOFSAFETYMEASURES,WORKCANBECARRIEDOUT11ISSTRICTLYPROHIBITEDONTHESAMEPIPESIMULTANEOUSLYINTWOPLACESANDTWOORMOREBLOCKINGBLINDBOARDOPERATIONSWHENPLUGGINGMULTIPLEBLIND,BLINDTOBLINDLOCATIONMAPANDPLATESNUMBERBYCONSTRUCTIONGENERALMANAGER,UNITYOFCOMMANDASSIGNMENTS12SIGNSINEACHBLOCKINGBLINDBOARDSHOWSTHATBLINDLOCATIONCTHEBLOCKINGBLINDBOARDPERMITSTHEMANAGEMENTOF1BLINDLOCATIONMAP,IMPLEMENTSECURITYMEASURES,AFTERTHEAPPROVALOFTHETECHNICALDEPARTMENT,ASSIGNMENTUNITSSTAFFTOCONFIRMJOBCOMPLEX,DANGEROUSPLACESREQUIREDSECURITYAUDITSOFTHEDEPARTMENTOFENVIRONMENTALPROTECTION,THECOMPANYINCHARGEOFSAFETYVICEPRESIDENTFORAPPROVAL4APPROVEAGOODBLOCKINGBLINDBOARDOPERATINGLICENSEINTRIPLICATE,MAINCONTRACTORS,OPERATINGUNITS,EACHHOLDACOPYOFTHEBIOSECTION5AFTERTHEENDOFTHEJOB,JOBS,TECHNICALCHECK,ACTIVITYHANDEDTHEBLINDLOCATIONTECHNOLOGY6WORKPERMITSMANAGEMENTSHOULDESTABLISHTHETICKETFILEINVENTORY,THETICKETISKEPTFOR3YEARSTHELIFTINGOPERATIONMANAGEMENTSYSTEM,PURPOSEINORDERTOCONTROLTHEPRODUCTIONWITHINTHEREGION,LIFTING,LIFTINGACTIVITIESTOPREVENTTHEOCCURRENCEOFACCIDENTS,THESYSTEMISFORMULATEDSECOND,THESCOPEOFAPPLICATIONOFTHISSYSTEMAPPLIESTOALLCOMPANIESWITHINTHELIFTINGOPERATIONTHIRD,LIFTINGALICENSEOFGRADEDCREDITTHREELEVELSOFMANAGEMENTIGENERALEQUIPMENT,WEIGHINGLESSTHAN1TONOFWEIGHTLIFTING,THELIFTINGOFTHERULES,TECHNOLOGYREVIEW,WORKSHOPDIRECTORFORAPPROVALBTHERULESOFWEIGHTEQUALTOORGREATERTHAN1TONLESSTHAN10TONSOFWEIGHTLIFTING,HOISTING,APPROVEDBYTHEWORKSHOP,EQUIPMENTMANAGEMENTDEPARTMENTFORAPPROVALCOFOVER10TONSANDHEAVYLIFTINGOPERATIONSPROJECTSORCONSTRUCTIONUNDERTHESPECIALCONDITIONS,SHALLPREPARELIFTINGPLAN,PERMITTOWORKSUBMITTEDTOCOMPANYEXECUTIVESANDSAFETYEQUIPMENT,THEJOINTSECURITYSECTORREVIEWCOMPETENTAFTERASSISTANTGENERALMANAGERAPPROVALFOUR,LIFTINGSAFETYREQUIREMENTS1LIFTINGWEIGHTSGREATERTHANOREQUALTO10TONNESOFTHEOBJECTANDTHESUBJECTOFCIVILENGINEERINGSTRUCTURES,HOISTINGCONSTRUCTIONPLANSHALLBEPREPAREDLOADISLESSTHAN10TONNES,BUTSMALLCOMPLEXSHAPES,STIFFNESS,LENGTHDIAMETERRATIO,PRECISIONPRECIOUS,UNDERTHESPECIALCONDITIONSOFCONSTRUCTION,SHOULDALSOPREPARECONSTRUCTIONPROGRAMMESHOISTINGCONSTRUCTIONPROGRAMMESEXAMINEDBYTHEPROJECTAUTHORITIES,SUBMITTEDTOTHECOMPETENTVPAPPROVALTOBEIMPLEMENTED2LIFTINGOPERATIONSMUSTSETUPTHEALERTLINEANDSETUPSPECIALCARE,GUARDIANSHIPPERSONNELMUSTWEARARMBANDS,LIFTINGREGIONALSTAFFOUTOFBOUNDS3LIFTINGOPERATIONSMUSTBEPROVIDEDFORLIFTINGLOADS,SLINGS,RIGGINGANDECONOMICCALCULATIONOPTIONS,DONOTOVERLOADWHENLIFTINGHEAVYOBJECTSCLOSETOORREACHTHERATEDLIFTINGCAPACITY,CHECKBRAKES,LOWHEIGHT,SHORTSTROKEAFTERTHELOADTEST,THENSMOOTHLYLIFTEDLARGEANDMEDIUMSIZEDEQUIPMENTBEFORELIFTING,LOADTESTSHOULDBECARRIEDOUTTRYHANGINGHEIGHTFORABOUT02MANDTHENCONDUCTARELIABILITYCHECKINCLUDINGTHESELECTIONANDCALCULATIONOFSAFETYFACTOROVERLOADLIFTINGISSTRICTLYPROHIBITED4BEFORELIFTINGMUSTPADTHEWOODANDTHEWOODUSEDMUSTBEOFADEQUATESIZEBESURETOOVER1MWHENLIFTINGREQUIRESFIREESCAPE,YOUMUSTCONTACTTHECIRCUITBREAKERINACCORDANCEWITHTHEPROVISIONS5LIFTINGOPERATIONSMUSTBERUNONALLKINDSOFHOISTINGMACHINERYPARTS,SAFETYDEVICESASWELLASSLINGS,RIGGINGADETAILEDSECURITYCHECKS,SECURITYDEVICESFORLIFTINGEQUIPMENTISSENSITIVEANDRELIABLE,NOILLNESSMUSTTRYBEFORELIFTINGCRANE,CONFIRMEDBEFORETHEYCANWORK6LIFTINGOPERATIONS,REMOVEDPLATFORMGUARDRAILMUSTBERESTOREDTHEBOLTACTIVITYFENCEREMOVALISSTRICTLYPROHIBITED7LIFTINGOPERATIONS,SHOULDHAVEADEQUATELIGHTINGATNIGHT,OUTDOOR16,LIFTINGTHEAPPROVALPROCEDUREISNOTCOMPLETE,SECURITYMEASURESARENOT288（千米）288（千米）40565640（88104）9688（10496）（學(xué)生舉例）（69172）2869（17228）兩個加數(shù)交換位置，和不變。155（145207）（155145）207這叫做加法交換律。先把前兩個數(shù)相加，或者先把后兩個數(shù)相加，和不變。這叫做加法結(jié)合律。ABBAABCABC課后小結(jié)加法運(yùn)算定律的運(yùn)用教學(xué)內(nèi)容P30/例3（加法運(yùn)算定律的運(yùn)用）教學(xué)目標(biāo)能運(yùn)用運(yùn)算定律進(jìn)行一些簡便運(yùn)算。培養(yǎng)學(xué)生根據(jù)具體情況，選擇算法的意識與能力，發(fā)展思維的靈活性。使學(xué)生感受數(shù)學(xué)與現(xiàn)實生活的聯(lián)系，能用所學(xué)知識解決簡單的實際問題。教學(xué)過程一、復(fù)習(xí)鞏固BLINDBOARDOPERATIONALSECURITYREQUIREMENTS1BLOCKINGBLINDBOARDOPERATIONSREQUIREDTOHANDLEBLOCKINGBLINDBOARDOPERATINGLICENSE,NOBLOCKINGBLINDBOARDOPERATINGLICENSEARENOTALLOWEDTOSMOKEBLOCKINGBLINDBOARDOPERATIONS2ITISSTRICTLYPROHIBITEDTOALTER,LENTTHEBLOCKINGBLINDBOARDOPERATINGLICENSECONTENTCONVERSIONANDEXPANSIONOFOPERATIONSORTRANSFERJOBSSITE,AGAINFORBLOCKINGBLINDBOARDOPERATINGLICENSE3INCOMPLETEJOBAPPROVALPROCEDURES,SAFETYMEASURESARENOTIMPLEMENTED,WORKENVIRONMENTDOESNOTMEETSECURITYREQUIREMENTS,WORKERSHAVETHERIGHTTOREFUSETOWORK4TOXICGASPIPING,EQUIPMENTBLOCKINGBLINDBOARD,NONIRRITANTGASPRESSURESHOULDBELESSTHAN200MMHGIRRITANTGASPRESSURESHOULDBELESSTHAN50MMHGGASTEMPERATURESHOULDBELESSTHAN60DEGREES5TECHNICALDEPARTMENTRESPONSIBLEFORDRAWINGBLINDLOCATIONMAP,NUMBERSTHEBLIND,CONSTRUCTIONPERSONNELWORK,BLINDLOCATIONMAPBYTECHNOLOGYARCHIVEFORFUTUREREFERENCE6THEBLINDPLUGOPERATINGPERSONNELMUSTWEARAPPROPRIATEPERSONALPROTECTIVEEQUIPMENT,MUSTDESIGNATEAPERSONRESPONSIBLEFORBLOCKINGBLINDBOARDWORK,ANDTODESIGNATEAPERSONRESPONSIBLEFORMONITORINGGUARDIANSAREADVISEDBYEXPERIENCEDOFFICERS,GUARDIANJOBSPEOPLEMUSTWEARAPPROPRIATEPROTECTIVEEQUIPMENTASREQUIRED,ANDGUARDIANSMUSTCHECK,IMPLEMENTINGRELEVANTSAFETYMEASURESONTHEJOBGUARDIANSMUS