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
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A.satellite communications
B.navigational information
C.weather information
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单项选择题
All towing vessels of 26 feet or longer while navigating are required to carry which item? （）
A.At least two lifeboats
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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
