The greatest strain,when lifting a load with the jumbo purchase,is on().

A . all of the parts,dividing the load equally B . the hauling part because it must absorb the frictional losses of all the sheaves C . the parts in the movable block D . the standing part because it is directly connected to the weight

时间:2022-11-09 16:17:27 所属题库:特种货物运输及有关规则题库

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