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时间:2020-04-25
《高一数学(人教版)必修五《第二章--数列》单元测试二.docx》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、第二章数列单元测试一一、选择题1.已知,则数列是()A.递增数列B.递减数列C.常数列D.不能确定2.数列中,,,则为()A.-3B.-11C.-5D.193.正偶数数列2,4,6,8,10…的递推公式是( )A.B.C.D.4.如果一个数列的前3项分别是1,2,3,下列结论中正确的是( )A.它一定是等差数列B.它一定是递增数列C.通项公式是D.以上结论都不一定对5.等差数列的相邻4项是,那么a,b的值分别是( )A.2,7 B.1,6C.0,5 D.无法确定6.已知等差数列的公差不为0且第二、三、六项构成等比数列,则公比为( ) A.1 B.2C.3
2、 D.47.等差数列a,b,c三项和为12,且a,b,c+2成等比数列,则a=( ) A.11或8 B.2C.8 D.-2或-88.在2和30之间插人两个正数,使前三个数成等比数列,后三个数成等差数列,则插人的两补数依次是( ) A.a=-5,b=-12.5 B.a=6,b=18 C.a=3,b=4 D.a=6,b=12.59.已知等差数列{}的公差,且,,成等比数列,则为搞好山东省交通科学研究所研发基地项目的结算审计工作,我跟踪审计部特针对本项目作如下要求,请各施工单位、供货单位遵照执行:andperformancetestcopiesofthe
3、record.Ifnecessary,reviewshouldbecarriedout;4)forspringhangers(includedsimplespring,hangersandconstantsupporthangers)itshouldalsoberecognizedassettingandlockingofloads.5)checkthesurfacequality,foldedlayeringandwithoutcracks,rustandotherdefects.5)aftercompletionofthetestandcontroldrawingnumberonebyon
4、e,byseriesbaled.Coloralloysteelparts,thepartsmarkinginstallationlocationandrotationaboutthedirectionyouwant.7.3.14.hangersinstallation7.3.14.1hangerlayouta.acleardesignofhangershouldbeinstalledstrictlyinaccordancewiththedrawingsanddesignsshallnotbeinstalledwrong,missing,etc.B.ownarrangementofpipings
5、upportandhangersetandselectionshouldbebasedoncomprehensiveanalysisofgenerallayoutofpipingsystems;coldinstallationofsteampipewithparticularattentionreservedforcompensationofthermalexpansiondisplacementandorientation.C.supportsystemsshouldberationaltowithstandpipeloads,staticloadandincidentalload;reas
6、onablepipingdisplacement;guaranteedundervariousconditions,stressarewithintheallowedrange.Strength,stiffness,andmeetrequirementstopreventvibrationandsoothingwater,withoutaffectingtheadjacentequipmentmaintenanceandotherpipinginstallationandexpansion.D.equipmentconnectedtotheinterfacetomeetpipelinethru
7、st(torque)limitrequirements;increasethestabilityofpipingsystemstopreventpipeline...Tubewallthickness(mm)2-34-67-10weldformnoslopemouthweldstrengtheningheighth(mm)1-1.51.5-2weldwidthb(mm)5-67-6hasslope
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