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.
Which of the following is discussed in the passage？
A. The events of the modem Olympics.
B. The significant meaning of the Olympic Games.
C. The awards of the Olympic Games.
D. Commercial development after Olympic Games.
What athletic events were held in the thirteenth ancient Olympics？
A great variety of events.
B. A field event only.
C. A track event only.
D. Some track and field events.
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