【单选题】每只100lx、使用寿命为1000h 的灯泡在服役期共消耗1000 kwh电能;某服务需要1000只这种灯泡,服役中将消耗( )电能Each 100lx bulb with a service life of 1000h consumes a total of 1000 kwh power during the service period; 1000 such bulbs are require...
【简答题】2–19 The lighting needs of a storage room are being met by 6 fluorescent light fixtures, each fixture containing four lamps rated at 60 W each. All the lamps are on during operating hours of the facil...