單項(xiàng)選擇題

After leaving the port, we used （）to clean the empty holds and decks.

A. fresh water
B. sea water
C. both A and B
D. ballast water

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單項(xiàng)選擇題

Everything on the bridge should （）clean and tidy.

A.kept
B.keep
C.be kept
D.keeping

單項(xiàng)選擇題

Decks, superstructure and hand rails may be washed with （）water at sea.

A.sea
B.ballast
C.fresh
D.cement