单项选择题
If two fuel service tanks are installed, the empty tank should be pumped up directly it is emptyWhat is the meaning of “directly” in the sentence above?（）
A.at once
B.as soon as
C.quickly
D.straight
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During tours of inspection in the machinery space, you found a fire on a running generator, what should you do first?（）
A.inform chief engineer officer immediately
B.stop the generator
C.let the duty officer in bridge determine how to do
D.wait for help -
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What is used for preventing pollution damage to the sea from ships?（）
A.MARPOL 73/78
B.SOLAS 74
C.STCW 78/95
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However, where immediate action is necessary to ensure safety of the ship, its machinery and crew, it must be taken by the engineer in chargeWhat dose “it” mean in the sentence above?（）
A.safety
B.the ship, its machinery and crew
C.immediate action
D.the engineer in charge
