4.如图所示有一木块放在水平地面上处于静止状态.下列说法中正确的是a A.木块受到的重力与地面对木块的支持力是一对平衡力 b.木块受到 Template




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tomski4.如图所示有一木块放在水平地面上处于静止状态.下列说法中正确的是a a.木块受到的重力与地面对木块的支持力是一对平衡力 b.木块受到 coloring