【单选题】【消耗次数：1】
力的平行四边形公理中的两个分力和它们的合力的作用范围
①
必须在同一个物体的同一点上；
②
可以在同一物体的不同点上；
③
可以在物体系统的不同物体上；
④
可以在两个刚体的不同点上。
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