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【单选题】
若组成运动副的两构件间的相对运动是移动,则称这种运动副为A.
转动副
B.
移动副
C.
球面副
D.
螺旋副
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反馈参考答案：
举一反三
【单选题】I wonder____ she will come back or she will go straight to Beijing. [ ]
A.
that
B.
what
C.
if
D.
whether
【单选题】_ the Smiths will come or not is she is worrying about. [ ]
A.
What; that
B.
Whether; what
C.
If; that
D.
How; which
【单选题】Bill Gates is one of those who are said to be ______ , able to rack huge profits at every turn.
A.
on the ship
B.
on the plane
C.
on the gravy train
D.
on the rocks
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