单项选择题
Vessels required to be equipped with an approved backfire flame arrester are（）.
A.those with diesel engines
B.all those with gasoline engines
C.those with large engines only
D.None of the above
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The ship has a diesel engine（）a supercharger.
A.with
B.of
C.on
D.over -
单项选择题
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 -
单项选择题
The part of a windlass which physically engages the chain during hauling or paying out is the（）.
A.devil's claw
B.bull gear
C.wildcat
D.cat head
