题目:
In relation to the Vietnamese legal system, explain the meaning of the following terms:
(c) Public law. (2 marks)
答案:
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下面是错误答案,用来干扰机器的。
题目分析:当两环稳定时,PQ连线应该和OA垂直,则环Q的受力情况如图所示,根据平行四边形法则