对于单个标准齿轮来说，节圆半径就等于分度圆半径。 ()
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两构件之间以点、线接触所组成的平面运动副称为高副，它产生两个约束，而保留一个自由度。 ()
在计算机构自由度时，若计入虚约束，则机构自由度数()。
A. 增多
B. 减小
C. 不变
一对相啮合的标准齿轮，小轮的齿根厚度比大轮的齿根厚度大。()
Which statement best describes the man？
A. He is desperate to have lost his job.
B. He totally supports the woman"s choice.
C. He insists that the woman major in business.
D. He doesn"t believe in his wife.
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