单项选择题
A.reading the gage pressure B.weighing the extinguisher C.discharging a small amount of CO2 D.seeing if the seal has been broken
A.used at the earliest opportunity B.hydrotested C.recharged D.weighed again in one month
A.maximum pressure allowed at that branch B.name of the space or spaces which it serves C.date of the last maintenance inspection D.pressure needed to maintain an effective stream at that point