若两个长方体的长、宽、高分别为5cm、4cm、3cm,把它们两个全等的面重合在一

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问题:

若两个长方体的长、宽、高分别为5cm、4cm、3cm,把它们两个全等的面重合在一起组成大长方体,则大长方体的对角线最大为________cm。

考点:柱、锥、台、球的结构特征
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Every country has its own culture.
Even though each country uses doors, doors may have   50  functions and purposes which lead to   51  differences.
When I first came to America, I noticed that a public building had two different   52  and they had distinct functions. You have to push the door with the word “ PUSH ” to go out of the building and to pull the door with the word “PULL” to   53  the building. This was new to me, because we use the      54  door in South Korea. For quite a few times I failed to go out of a shopping centre and was embarrassed.
The way of using school bus doors was also   55  to me. I used to take the school bus to school. The school decided that when the driver opened both the front and back door. Students who were getting off the bus should get off first, and students who were getting on should get on   56  in South Korea. We do not need to wait for people to  57 . One morning I hurried to the bus, and when the bus doors opened, I  58  tried to get on the school bus through the front door. All the students around looked at me. I was totally   59 , and my face went red.
小题1:
A.differentB.importantC.practicalD.unusual
小题2:
A.nationalB.embarrassingC.amazingD.cultural
小题3:
A.exitsB.entrancesC.signsD.doors
小题4:
A.enterB.leaveC.openD.close
小题5:
A.mainB.sameC.frontD.back
小题6:
A.annoyingB.hardC.satisfyingD.strange
小题7:
A.soonerB.laterC.fasterD.earlier
小题8:
A.get onB.get offC.get upD.get up
小题9:
A.politelyB.patientlyC.unconsciouslyD.slowly
小题10:
A.embarrassed B.annoyedC.unsatisfiedD.excited
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周围血管阻力增加()

A.中心静脉压低,动脉压低 

B.中心静脉压低,动脉压正常 

C.中心静脉压高,动脉压低 

D.中心静脉压高,动脉压正常 

E.中心静脉压正常,动脉压低

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可燃物质

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女职工可以从事的作业是()

A.矿山井下作业

B.森林业伐木作业

C.建筑业脚手架的组装和拆除作业

D.抹灰作业

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压力机的双手操纵装置的保护原理,是将滑块的下行程运动与对手动作的限制联系起来,即在滑块的下行程期间,强制操作者必须用双手同时按压操纵器,离合器才结合使滑块向下运动。在此期间,如果操作者哪怕仅有一只手离开操纵器(或双手都离开),在伸入危险区之前,滑块停止下行程或超过下死点,使双手没有机会进入危险区,从而避免伤害。双手操纵式安全装置()

A.既保护操作者也保护其他人员的安全

B.只保护危险区附近的其他人员的安全

C.只保护操作者的安全

D.保护操作者的安全,不一定保护其他人员的安全

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