人站在匀速运动的自动扶梯上如图所示.关于人受力情况的说法中正确的是 A.受到三个力的作用即重力弹力�擦力b.人所受的弹力大于重力 Template




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tomski人站在匀速运动的自动扶梯上如图所示.关于人受力情况的说法中正确的是 a.受到三个力的作用即重力弹力�擦力b.人所受的弹力大于重力 coloring