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單項(xiàng)選擇題

（）as the chemical extinguisher agent, should be used for a an electric fire.

A.Dry chemical or foam
B.Foam or soda acid
C.carbon dioxide or foam
D.carbon dioxide or dry chemical

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單項(xiàng)選擇題

（）a number of home-made nautical instruments and foreign-made meters on the bridge.

A.Have
B.Has
C.There is
D.There are

單項(xiàng)選擇題

（）about 20 sq.m to be sand-blasted.

A.The rusting area
B.The rusted area
C.The corroded area
D.The corrosive area

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