For a given weight of cargo,the stress on the heel block of a cargo boom().

A . increases as the cargo closes the head while hoisting B . increases if the cargo runner is doubled up C . decreases as the boom is topped to a greater angle D . is determined by the thrust stresses on the boom

时间:2022-10-09 01:18:27 所属题库:货物装卸货作业题库

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