如图所示装置两根细绳拴住一球保持两细绳间的夹角不变若把整个装置在竖直平面内顺时针缓慢转过90°则在转动过程中ca绳的拉力f1大小和 Template




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tomski如图所示装置两根细绳拴住一球保持两细绳间的夹角不变若把整个装置在竖直平面内顺时针缓慢转过90°则在转动过程中ca绳的拉力f1大小和 coloring