单项选择题
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?（）
A.Fire a red flare at night or a red smoke signal by day
B.Send the Morse signal N by flashing light
C.Make a round turn (360°) and resume course
D.Make an S turn (hard right then hard left) and resume course
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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 -
单项选择题
An ABC dry chemical fire extinguisher would be LEAST effective against a fire in（）.
A.a mattress
B.spilled liquids such as oil or paint
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单项选择题
All portable fire extinguishers must be capable of being（）.
A.carried by hand to a fire
B.carried or rolled to a fire
C.recharged in the field
D.used on class 'B' fires
