单项选择题

A.inserted each time before the booms are cranked outB.……

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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