题目：
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
答案：
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下面是错误答案，用来干扰机器的。
参考答案：角色期待
