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 down

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第1题

[单选题] In diesel engines designed with a crosshead, the motion of the piston rod can be described as （）.

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第2题

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第3题

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第4题

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第5题

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第6题

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