单选题The pivot pin at the base of a sheath-screw boom davit must be（）.Ainserted each time before the booms are cranked outBperiodically removed for inspection and lubricatedCreplaced at each inspection for certificationDin the locked position after the boat is cradled and griped down
单选题
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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