试题与答案

杠杆OB的中点A处挂一重物G,在杠杆的B端施加一个方向始终保持垂直,力F会如何?

题型:问答题

题目:

杠杆OB的中点A处挂一重物G,在杠杆的B端施加一个方向始终保持垂直,力F会如何?

答案:

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