重合度 εα= 1.6 表示在实际啮合线上有()长度属于双齿啮合区。
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渐开线齿轮形状完全取决于()。
A. 压力角
B. 齿数
C. 基圆半径
滚子从动件盘形凸轮的基圆半径和压力角应在凸轮的理论轮廓上度量。()
Which of the following details about the Olympics is CORRECT?
A. The Olympic Games are only held in summer.
B. The first Olympic competition was held in 776BC.
C. The Games had been once discontinued for a long time.
D. The first Olympics of modern times were held in 1900s.