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Seawater may be used for drinking water （）.

A.at a maximum rate of two ounces per day
B.after mixing with an equal quantity of fresh water
C.if gather during or immediately after a hard rain
D.under no circumstance

單項(xiàng)選擇題

A class "D" fire would be considered as burning （）.

A.wood
B.oil
C.electrical equipment
D.magnesium

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Which of the following gases represents the greatest threat to personnel safety in an engine room where the exhaust is leaking from a diesel engine?（）

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Seawater may be used for drinking water （）.

A class "D" fire would be considered as burning （）.