用两根绳子系住一重物如图所示绳oa与天花板间的夹角 不变当用手拉绳子ob使ob由水平转�竖直的过程中 Ob绳所受的拉力将 A.始终 Template




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tomski用两根绳子系住一重物如图所示绳oa与天花板间的夹角 不变当用手拉绳子ob使ob由水平转�竖直的过程中 ob绳所受的拉力将 coloring