在如图所示的实验电路中,闭合开关,移动滑动变阻器的滑片后,发现电流表、电压表均有示数,小灯泡不亮.则故障原因是( )
A:L断路
B:L短路
C:R断路
D:R短路
根据上下文,完成对话
(1)A: What's ____ name?
B: His name ____ Tome White.
A: What's his ____ ____?
B:____ 62278092.
(2)A: What's her ____ name?
B: Mary.
A: And what is her ____ name?
B: White. She is Mary White.
下列有关实验原理或实验操作正确的( )