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

国民党一大对三民主义作出了新的解释，其中关于民生主义的解释有（）。

A.各民族一律平等

B.节制资本

C.改善工农的生活状况

D.平均地权