如图所示在拉力f的作用下重80n的物块a正以02ms的速度在水平面上做匀速直线运动此时弹簧测力计的示数为20n该装置的机械效率为 Template




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tomski如图所示在拉力f的作用下重80n的物块a正以02ms的速度在水平面上做匀速直线运动此时弹簧测力计的示数为20n该装置的机械效率为 coloring