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 AMVER is a system which provides（）.
单项选择题 All towing vessels of 26 feet or longer while navigating are required to carry which item? （）
单项选择题 All portable fire extinguishers must be capable of being（）.
