问题
选择题
如图所示，理想变压器原线圈输入交流i=Imsinωt，副线圈按有一电流表和负载电阻R，电流表的示数为0.10A．在t= 时（T为交流的周期），原线圈中的电流瞬时值为0.03A．变压器的原、副线圈的匝数比为（ ）A．10：3 B．3：10 C．3：10 D．10  |
：3
答案
答案：D
搜题请搜索小程序“爱下问搜题”
| 如图所示，理想变压器原线圈输入交流i=Imsinωt，副线圈按有一电流表和负载电阻R，电流表的示数为0.10A．在t=时（T为交流的周期），原线圈中的电流瞬时值为0.03A．变压器的原、副线圈的匝数比为（ ） A．10：3 B．3：10 C．3：10 D．10 |
答案：D
| 完形填空。 | |||
| Wang Xiaojun is 12 years old. He lives in the country in Hubei Province. Today is his birthday. His parents prepare a nice 1 for him, but the boy says, "I won't have the dinner 2 after the dinner, today is over, and my parents are leaving for Shenzhen tomorrow. I don't want to let 3 go." It is the first birthday that Wang Xiaojun is 4 with his parents in three years. In the past three years, his parents stayed in Shenzhen and worked to make 5 . They haven't seen their son 6 three years. Tomorrow they 7 leave home to go to Shenzhen. Wang is not the only stay-at-home child. In the country of China, there are more than 20 8 children staying at home without their parents. Stay-at-home children face a lot of 9 . Many of them stay with their grandparents. They get less care from parents. They often 10 lonely. Some of them don't study well because their parents can't help them with their study. The Chinese government show cares about the children very much and is trying to solve their problems. | |||
|