With a given load on the cargo hook,tension in a single span topping lift().

A . increases as the boom's angle to the horizontal increases B . is at a maximum when the boom is at a 45° angle to the horizontal C . increases as the boom's angle to the horizontal decreases D . decreases as the boom's angle to the horizontal decrease

时间:2022-10-11 12:52:50 所属题库:货物保险合同与业务题库

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