问题
单项选择题
Regular foam can be used on all but which flammable liquid?（）
A.Motor gasoline
B.Jet fuel
C.Crude petroleum
D.Alcohol
答案
参考答案：D
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Regular foam can be used on all but which flammable liquid?（）
A.Motor gasoline
B.Jet fuel
C.Crude petroleum
D.Alcohol
参考答案：D