关于的功率和效率下列说法正确的是a机械的功率越小表示机械做功越慢b使用机械可以省力省距离也可以省功c机械做功越快机械效率越高d Template




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tomski关于的功率和效率下列说法正确的是a机械的功率越小表示机械做功越慢b使用机械可以省力省距离也可以省功c机械做功越快机械效率越高d coloring