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铸铁散热器与钢制散热器相比有如优、缺点?

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什么叫间接触电防护?采取的措施是什么?

如图6-1所示的热水采暖系统,试问:(1)该热水采暖系统是机械循环的还是自然循环的系统?是上供下回式采暖系统还是下供上回式采暖系统?
(2)图中标号4是指什么?在系统中有何作用? (3)图中标号3是指什么?在系统中有何作用?
(4)图左侧与图右侧的立管布置最大区别是什么?立管Ⅲ与立管Ⅳ布置又有什么不同?

基坑周边应设置排水沟,尽量安装防护栏杆,防护栏杆高度一般不高于1.2m,并在基坑内设置上下通道。()

AllclientcomputersinyournetworkrunWindowsXP.Someofthecomputersarepartofasecurenetwork.Someofthecomputersconnecttothenetworkbyusingvirtualprivatenetworking(VPN).YouareplanningtodeployWindows7.
Youhavethefollowingrequirements:
Useadedicatedserverfordeployment.
Useasingleoperatingsystemimagefordeployment.
Ensurethatyoucanuseremovablemediatodeploytheimage.
Ensurethatyoucanselectwhichapplicationsareinstalledontoaclientcomputeratthetimeofdeployment.
Youneedtodesignadeploymentstrategythatmeetstherequirements.
Whatshouldyoudo?()

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