When hoisting a boat on gravity type davits using an electric motor driven winch,the davit arms should be brought up().

A . to their final position with the winch operating at slow speed B . to the bar stop,and then hand cranked to their final position C . until just before they make contact with the limit switch,and then hand cranked to their final position D . to the embarkation deck,and then hand cranked to their final positio

时间:2022-10-03 22:15:54 所属题库:甲板与船体保养题库

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