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yc=45mm yc=40mm yc=35mm y=30mm
1564.9 1711.4 2097.8 1 956.2
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1564.9 1711.4 2097.8 1956.2
情况(1)时质心坐标xC、yC均改变 情况(2)时质心坐标xC、yC均改变 情况(2)时质心坐标xC不变,yC改变 情况(2)时质心坐标xC、yC均不变
7/1.68; 49/0.64; 84/0.49; 126/0.39。
1564.9 1711.4 2097.8 1 956.2
1564.9 1711.4 2097.8 1956
1564.9 1711.4 1956.2 2094.8