The pivot pin at the base of a sheath-screw boom davit must be().

A . inserted each time before the booms are cranked out B . periodically removed for inspection and lubricated C . replaced at each inspection for certification D . in the locked position after the boat is cradled and griped dow

时间:2022-10-09 13:40:07 所属题库:船舶动力装置题库

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