A:灯泡L1、L2都能正常发光
B:灯泡L1比灯泡L2亮
C:灯泡L2比灯泡L1亮
D:灯泡L1、L2一样亮
①c= (w×1000×d)Mr
②m=V×d×( w100 )
③w%=(c×Mr).(1 000×d)%
④c= (1000×m)(V×Mr) .
_____ Amy met Peter, she with her mum _______ for the bus at the bus station.