如图所示重20n的物体b在水平拉力f作用下做匀速直线运动这时弹簧测力计的示数为6n则以下说法正确的是 A.地面�擦力是26nb.拉力 Template




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tomski如图所示重20n的物体b在水平拉力f作用下做匀速直线运动这时弹簧测力计的示数为6n则以下说法正确的是 a.地面�擦力是26nb.拉力 coloring