如图轻质杠杆上挂着7个相同的钩码这时杠杆恰好平衡.若杠杆的两端再同时增挂一个相同的钩码则杠杆将会 A.左端下降b.右端下降c.杠杆 Template




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tomski如图轻质杠杆上挂着7个相同的钩码这时杠杆恰好平衡.若杠杆的两端再同时增挂一个相同的钩码则杠杆将会 a.左端下降b.右端下降c.杠杆 coloring