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單項(xiàng)選擇題

The necessity of the segregation of cargoes is determined by（）.

A.experience from practice
B.various types of cargoes
C.different types of ships
D.personal abilities

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單項(xiàng)選擇題

The officer of the watch should（）comply with the collision rules.

A.some times
B.often
C.at all times
D.seldom

單項(xiàng)選擇題

The phrase when built in the certificate of vessel’s nationality definitely means（）.

A.when was your vessel built
B.at what time is your vessel building
C.when is your vessel built
D.at what time you built your vessel

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