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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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

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
C.high voltage electrical gear
D.a trash can

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

单项选择题All of the following are part of the fire triangle EXCEPT（）.

A.electricity
B.fuel
C.oxygen
D.heat

单项选择题After extinguishing a paint locker fire using the fixed CO2 system，the next action is to have the space（）.

A.opened and burned material removed
B.left closed with vents off until all boundaries are cool
C.checked for oxygen content
D.doused with water to prevent reflash