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單項(xiàng)選擇題

Captain said that very clearly so that nobody was in any（）about what was meant?

A.doubt
B.question
C.wonder
D.consideration

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單項(xiàng)選擇題

Carbon dioxide as a fire fighting agent has which advantage over other agents?（）.

A.It causes minimal damage
B.It is safe for personnel
C.It is cheaper
D.It is most effective on a per unit basis

單項(xiàng)選擇題

Certain cargoes must be segregated because of their（）.

A.inherent characteristics
B.weight
C.destination
D.danger to humans

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