单项选择题
One of the methods NOT usually allowed in cleaning up oil spills in the United States is （）.
A.skimmers B.straw C.dispersants D.sawdust
单项选择题 Which of the listed classes of fire would most likely occur in the engine room of a vessel?（）
单项选择题 If ignited, which of the listed materials would be a class "B" fire?（）
单项选择题 Which statement concerning the collection of fresh water is FALSE?（）
