The most suitable fire-fighting agent in portable extinguishers on A/C is _______ .
A.carbon dioxide
B.dry chemical goods
C.carbon tetrachloride
D.water
正确答案是A
The most suitable fire-fighting agent in portable extinguishers on A/C is _______ .
A.carbon dioxide
B.dry chemical goods
C.carbon tetrachloride
D.water
正确答案是A