單項(xiàng)選擇題

Be carefully when you（）the derrick.

A.operate
B.operating
C.operated
D.operates

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單項(xiàng)選擇題

Before using a fixed C0₂ system to fight an engine room fire,you must（）.

A.secure the engine room ventilation
B.secure the machinery in the engine room
C.evacuate all engine room personnel
D.ALL of the above

單項(xiàng)選擇題

By regulation, cargo tanks must be inert before and during what operation?（）.

A.Stripping
B.Loading
C.Cleaning
D.Crude oil washing