人站在自动扶梯的水平踏板上随扶梯斜�上匀速运动如图所示.以下说法正确的是 A人受到重力支持力和�擦力的作用b人受到重力和支持力的 Template




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tomski人站在自动扶梯的水平踏板上随扶梯斜�上匀速运动如图所示.以下说法正确的是 a人受到重力支持力和�擦力的作用b人受到重力和支持力的 coloring