题目内容
（请给出正确答案）
[单选题]
【单选题】He is one of the best players in the game,____？
A.is he
B.doesn’t he
C.isn’t he
D.does he
提问人：网友wfl2000
发布时间：2022-01-07
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An acrobatics performs motor cycling on the inner surface of a cylindrical wall. Assume the total masses of the acrobatics and the motor are m and radius of the cylinder is R. The actor rides the motor to make spin circular motion with speed of
on the vertical wall; the ascending height per round is h, as shoun in the figure. Solve the forces the wall to the actor and the motor.
