单项选择题
一实心圆轴，两端受扭转力偶的作用，若将轴的截面积增加一倍，则其抗扭刚度变为原来的（ ）倍。 A.
16 B.
8 C.
4 D.
2
一实心圆轴，两端受扭转力偶的作用，若将轴的截面积增加一倍，则其抗扭刚度变为原来的（ ）倍。 A.
16 B.
8 C.
4 D.
2
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As soon as we are _______ a position to accept new orders, we will contact you immediately.
As soon as we are _______ a position to accept new orders, we will contact you immediately.
A． with
B． on
C． in
D． under