单项选择题
An advantage of a dry chemical over a carbon dioxide fire extinguish is its（）.
A.greater range B.effective on all types of fires C.cleanliness D.All of the above
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（）.
单项选择题 An aneroid barometer is an instrument（）.
