单项选择题
An engine compartment gasoline fire requires which type of extinguisher?（）.
A.Carbon dioxide
B.Dry chemical
C.Foam
D.All of the above
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A.pack-strap carry
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An aircraft has indicated that he wants you to change course and follow him. You cannot comply because of an emergency on board. Which signal should you make?（）
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单项选择题
An advantage of a dry chemical over a carbon dioxide fire extinguisher is its（）.
A.greater range
B.effectiveness on all types of fires
C.cleanliness
D.All of the above
