基站着火时，是否可以开窗，是否需要断电，用什么灭火器扑灭小火（）

A.不可以.要.1211灭火器

B.可以.不要.消防水枪

C.不可以.要.用衣服盖灭

D.可以.不要.二氧化碳灭火器

Recharging a previously used cartridge-operated dry-chemical extinguisher is accomplished by（）.

A.authorized fire equipment servicing personnel only

B.replacing the propellent cartridge and refilling with powder

C.puncturing the cartridge seal after installation

D.recharging the cartridge and refilling it with powder