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(2013·天津八中高三第三次月考,18题)如图所示,小球A.系在细线的一端,线的另一端固定在O.点,O.点到水平面的距离为h。物块B.质量是小球的5倍,至于粗糙的水平面上且位于O.点正下方,物块与水...

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