一物体在互相垂直的两个恒力F 1 、F 2 作用下由静止开始运动一段位移, F 1 对物体做功3J, F 2 对物体做功4J,则F 1 与F 2 的合力对物体做功为 ( )
A.
5 J
B.
6J
C.
7J
D.
8 J
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【简答题】Translation 1) For the first time in my life I had to handle a serious financial situation on my own because my parents were no longer around to help me out. 2)Being safely moved into my new home and ...