灯泡的钨丝断了,将其搭接起来,结果发现比原来亮了许多,这是因为()。
A.电源电压提高了;
B.灯泡的阻值变大了;
C.灯泡的阻值减小了;
D.灯泡的阻值不变。
参考答案:C
根据句意用所给词的适当形式填空。
1. Have you _____(repair) the bicycle yet?
2. Mary quietly _____ (fill) the basket with good things for the poor children.
3. The teacher _____ (shut) her book and asked a question.
4. The boy is _____ (carry) the bag for his sister.
5. They started _____ (put) up a small house the next day.
在下述P2P网络中,不属于混合式结构的是( )。
A.BitTorrent
B.Maze
C.Skype
D.PPLive