如图所示将木块放在粗糙程度相同的水平桌面上小华沿直线水平匀速拉动木块在木块运动过程中 A.木块对桌面的压力大于木块受到的重力 B.木头 Template




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tomski如图所示将木块放在粗糙程度相同的水平桌面上小华沿直线水平匀速拉动木块在木块运动过程中 a.木块对桌面的压力大于木块受到的重力 b.木头 coloring