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單項選擇題

（）on cargo lights.

A.Close
B.Switch
C.Open
D.All above.

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單項選擇題

These goods shall be handled with （）.

A.caution
B.poisonous
C.flammable
D.dangerous

單項選擇題

Before （）the harbour, all derricks must be secured properly.

A.leave
B.leaved
C.to leave
D.leaving

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