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單項(xiàng)選擇題

Before entering a tank, always check the vapor content（）a combustible gas indicator.

A.with
B.by
C.of
D.for

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單項(xiàng)選擇題

Direct delivery and discharge can（）the handling operation.

A.speed down
B.quick
C.slow down
D.facilitate

單項(xiàng)選擇題

Do you require any further assistance? My ship is safe now and no assistance is necessary. This VHF communication generally takes place during（）.

A.salvage operation
B.cargo discharging
C.bunkering
D.towing operation

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