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图中物体m机械能守恒的是a．物块沿固定斜面匀速下滑b．物块在f作用下沿固定光滑斜面上滑c．小球由静止沿光滑半圆形固定轨道下滑d．细线拴住小球绕. 图中物体m机械能守恒的是a．物块沿固定斜面匀速下滑b．物块在f作用下沿固定光滑斜面上滑c．小球由静止沿光滑半圆形固定轨道下滑d．细线拴住小球绕 ...