取一根粗细均匀的铁丝在它的中点用线悬挂起来铁丝恰好平衡.如果把其右半段对折起来a.右端�下沉b.左端�下沉c.仍然保持水平平衡d.不能确定 Template




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tomski取一根粗细均匀的铁丝在它的中点用线悬挂起来铁丝恰好平衡.如果把其右半段对折起来a.右端�下沉b.左端�下沉c.仍然保持水平平衡d.不能确定 coloring