單項(xiàng)選擇題

A spark arrestor（）.

A.keeps sparks from falling into an open tank
B.secures covers on ullage openings
C.prevents sparks from getting out of an engine's exhaust system
D.grounds static electricity

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單項(xiàng)選擇題

A relief valve for a cargo pump is generally installed（）.

A.after the discharge valve
B.between the pump and discharge valve
C.after the suction valve
D.between the pump and suction valve

單項(xiàng)選擇題

A gas-free certificate would usually be issued by a(n)（）.

A.CCS marine surveyor
B.certified marine chemist
C.port engineer
D.MSA marine inspector