题目

把灯L1，接到一个电压恒定的电源上，L1的电功率是100W.如果把它与另一个灯L2.串联起来再接到电源上，L2的电功率是9W.问此时灯L1的功率是多少(假定灯泡的电阻恒定不变)? 答案：答案:1W或81W根据首字母提示，补全下面信中所缺的单词，使其意义完整。Dear Henry,Thank you for your  i.小题1: . I’m sorry I can’t v 小题2:   you this week. I am r 小题3:   busy. This evening I’m going to my c  小题4:   birthday party. And t  小题5:  , I have to go to the dentist, because I have a t小题6: .  (Yuck!)   On W  小题7: , I have tennis training w小题8:   the school team. And I have to study for my c  小题9:   test on Thursday. On Friday evening, I’m going to the movies with some friends. W 小题10:  you like to come to the movies with us on Friday ?Write soon.Sonia