问题
多选题
如图所示，一理想变压器原线圈匝数n1=1100匝，副线圈匝数n2=180匝，交流电源的电压
，电阻R=45Ω，电压表、电流表均为理想电表，则
A．交流电的频率为50Hz
B．A1的示数约为0.13A
C．A2的示数约为1.1A
D．V的示数为36V
答案
BD
搜题请搜索小程序“爱下问搜题”
如图所示，一理想变压器原线圈匝数n1=1100匝，副线圈匝数n2=180匝，交流电源的电压，电阻R=45Ω，电压表、电流表均为理想电表，则
A．交流电的频率为50Hz
B．A1的示数约为0.13A
C．A2的示数约为1.1A
D．V的示数为36V
BD
| 完形填空。 | ||||
| Liu Qian is a magician (魔术师) from Taiwan. For the CCTV Spring Festival Gala (春晚) he put on two magic shows. They were very 1 . Now everyone is mad about magic. We all want to know 2 a trick! Liu didn't go to any magic school. He learned 3 . He worked hard at it. Now he is a great 4 . When Liu was seven, he saw a coin trick in a big store. At that 5 , Liu decided to learn magic. Liu practiced hard 6 his skills. Then one day he was able to put on a show for his class. "I saw the 7 on everyone's face. It was cool." Liu still practices hard today. He may spend three years 8 on a new show. Many people fell in love 9 magic after Liu's two shows. They're studying how Liu's tricks work. I hear that one boy can do the tricks in Liu's show. He is a top student in my class. Everyone likes him. I can't wait 10 his shows! Sun Wei from Xi' an loved magic when he was younger. He spends lots of time studying how to play tricks. Now he could do card tricks really well. | ||||
|