已知m,n为不同的直线,α,β为不同的平面,下列四个命题中,正确的是( ) A.

题型:选择题

问题:

已知m,n为不同的直线,α,β为不同的平面,下列四个命题中,正确的是(  )

A.若mα,nα,则mn

B.若m⊂α,n⊂α,且mβ,nβ,则αβ

C.若α⊥β,m⊂α,则m⊥β

D.若α⊥β,m⊥β,m⊄α,则mα

考点:空间中直线与直线的位置关系空间中直线与平面的位置关系平面与平面的位置关系
题型:选择题

根据短文内容,判断正(T)误(F)。

     The old name for films was "oving pictures".In America they still call them"movies" and

they say "Shall we go to the movies?"hen we say "Shall we go to the cinema?"

     A boy once said to his friend," Do you like moving pictures?" His friend thought he was going

to invite him to go to the cinema, so he said,"Yes, please.  I like moving pictures very much."

    "Good,"said the boy. "My father has a picture shop.  He sells pictures.  This evening I must

move pictures from one room to another. You like moving pictures, so I think you will enjoy

moving pictures for me."

( )1. In old times people called films"moving pictures".                                  

( )2. The Americans will say"Shall we go to the cinema?"when they ask their friends to go  

            to see a film.                                                                        

( )3. Once a boy asked his friend to move some heavy boxes of pictures from one room to      

            another.                                                                              

( )4. His friend liked pictures very much.                                                  

( )5. His friend didn't really understand him when he asked" Do you like moving pictures?"

题型:选择题

将船体内部空间分隔成舱室的竖壁或斜壁是()。

A、甲板

B、舱壁

C、内底板

D、船壳板

题型:选择题

旅客救生衣和演示救生衣颜色均为红色。()

题型:选择题

单相电能表相(火)线、零线颠倒接入对电能表的正确计量没有潜在的影响。

题型:选择题

某企业大批量生产某种单一产品,该企业为了编制下年度的年度、季度计划,正进行生产能力核算工作。该企业全年制度工作日为250天,两班制,每班有效工作时间为7.5小时。已知:某车工车间共有车床20台,该车间单件产品时间定额为1小时;某钳工车间生产面积为145平方米,每件产品占用生产面积5平方米,该车间单件产品时间定额为1.5小时。
根据以上材料,回答下列问题:

该钳工车间的年生产能力是______件。

A.60000

B.62500

C.65000

D.72500

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