题目

如图所示，电路中有L1、L2两盏灯，请在图中内分别填入A或V的符号，要求开关闭合时L1、L2都能发光，且两电表的示数均不为零。（__________） 答案：【答案】【解析】由图可知，当甲乙都为电流表时，电源短路；甲乙都为电压表时，只有灯泡L1接入电路，灯泡L2不发光；当甲为电压表、乙为电流表时，灯泡L2被短路，不发光；当甲为电流表、乙为电压表时，该电路为并联电路，电流表测量L2的电流，电压表测量支路两端的电压，两个灯泡都发光，如二、句型转换 ( 10分) 1. They pretended that they were barbers. They pretended ____________ ______________ barber. 2. Honestly speaking, I don’t want to stay here any longer. ________ ________, I don’t want to stay here any longer . 3. In fact, I landed in Britain by accident． In fact, I _________ ____________ land in Britain. 4. Because of the bad weather, a few students were absent from school. The bad weather _________ __________ a few students’absence of school. 5. It would be wrong that I don’t trust a gentlman. It would be wrong ________ me ________ _________ trust a gentlman.