如图3所示要使杠杆处于平衡状态在a点分别作用的四个力中最小的是a.f1 B.f2 C.f3 D.f4——青夏教育精英家教�—— Template




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tomski如图3所示要使杠杆处于平衡状态在a点分别作用的四个力中最小的是a.f1 b.f2 c.f3 coloring