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she has a large metacentric height she has a high centre of gravity her metacenter above baseline is high her centre of gravity is low"
Longitudinal center of buoyancy and longitudinal center of gravity． Longitudinal center of floatation and longitudinal center of gravity． Longitudinal center of floatation and longitudinal center of buoyancy． Longitudinal tipping center and longitudinal center of gravity"
Liquids with different viscosities will always have the same specific gravity Liquids with different viscosities will never have the same specific gravity Viscosity and specific gravity are directly proportional Viscosity and specific gravity are not related in that one does not define or limitthe other
There were no gravity There was not any gravity Were there no gravity was there no gravity
see have seen was seeing has seen
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重力场强度太小 同时选择两个粒子添加场只能有效地添加给一个粒子，另外一个不受影响 重力场方向对于particle2粒子来说不是向下的 复制出来的粒子particle2不能认识到时间的变化，所以不会下落
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