本题目来源于试卷: Mechanical Advantage，类别为 美国物理杯赛(Physics Bowl)
[单选题]
99.10: A simple machine can NOT jp0n0+cq4 yme: nai1qdo whic . i3xaq2me7 cbh of the following:
A. have a mechanical advantage greater than 1.
B. change the direction of the force.
C. move the resistance a greater distance than the applied force.
D. increase the energy put into it.
E. produce a force on the resistance which is greater than the applied force.
参考答案: D
本题详细解析:
暂无
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