重力为10n的物体放在水平桌面上在f=3n水平�右的作用力下匀速� 右运动则桌面对物体的�擦力的大小是 方� 撤去拉力后物体还会继续 Template




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tomski重力为10n的物体放在水平桌面上在f=3n水平�右的作用力下匀速� 右运动则桌面对物体的�擦力的大小是 方� coloring