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【单选题】
根据圆轴扭转的平面假设,可以认为圆轴扭转时其横截面 。A.
形状尺寸不变，直径仍为直线
B.
形状尺寸改变，直径仍为直线
C.
形状尺寸不变，直径不为直线
D.
形状尺寸改变，直径不为直线
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反馈参考答案：
举一反三
【单选题】一瓶氦气和一瓶氮气的密度相同,分子平均平动动能相同,而且都处于平衡态,则它们()
A.
温度相同，压强相同
B.
温度、压强都不相同
C.
温度相同，但氦气的压强大于氮气的压强
D.
温度相同，但氦气的压强小于氮气的压强
【单选题】Text … As time【C1】______by, I was able to work【C2】______my fears. Now I understand that the closest I have ever felt to God is in the back of an ambulance. When I【C3】______to help【C4】______strangers, ...
A.
went
B.
go
C.
goes
D.
going
【简答题】听短文填空。 I only know that __ 1 __ have been able to clone a sheep , but I know __ 2 __ how nor why. This morning our class __ 3 __ the __ 4 __ of cloning. Some of my __ 5 __ thought it was a good idea t...
【简答题】当拉格朗日中值定理中，f(x)满足_________时，即为罗尔定理．
【单选题】I hope that the little _____ I have been able to do does good to them all. [ ]
A.
which
B.
what
C.
that
D.
when
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