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 An advantage of a dry chemical over a carbon dioxide fire extinguish is its（）.
单项选择题 An advantage of an ABC dry chemical over a carbon dioxide extinguisher is（）.
单项选择题 An advantage of nylon rope over manila is that nylon rope（）.
