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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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单选题While cranking out a quadrantal davit，slippage of the quadrant due to excessive wear or failure of the teeth in the quadrant will cause the（）.A
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单选题With a given load on the cargo hook，tension in a single span topping lift（）.A
increases as the boom's angle to the horizontal increasesB
is at a maximum when the boom is at a 45° angle to the horizontalC
increases as the boom's angle to the horizontal decreasesD
decreases as the boom's angle to the horizontal decreases
考题
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 outB
periodically removed for inspection and lubricatedC
replaced at each inspection for certificationD
in the locked position after the boat is cradled and griped down
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