單項選擇題

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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單項選擇題

The ship has a diesel engine（）a supercharger.

A.with
B.of
C.on
D.over

單項選擇題

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