单项选择题
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
单项选择题 A class "D" fire would be considered as burning （）.
单项选择题 One of the methods NOT usually allowed in cleaning up oil spills in the United States is （）.
单项选择题 Which of the listed classes of fire would most likely occur in the engine room of a vessel?（）
