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【2017·广东省广州市高三模拟考试】(14分)如图,水平面上相距为L.=5m的P.、Q.两点分别固定一竖直挡板,一质量为M.=2kg的小物块B.静止在O.点,OP段光滑,OQ段粗糙且长度为d=3m。...

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