问题
选择题
| 如图所示的LC振荡电路，在某时刻的磁场方向如图所示，则下列判断不正确的是（ ） A．若磁场正在增强，则电场能正在减少，电容器上极板带正电 B．若磁场正在减弱，则电场能正在增强，电容器上极板带正电 C．振荡电流的变化周期为：2π D．电场能量的变化周期为：π  |
答案
答案：A
搜题请搜索小程序“爱下问搜题”
| 如图所示的LC振荡电路，在某时刻的磁场方向如图所示，则下列判断不正确的是（ ） A．若磁场正在增强，则电场能正在减少，电容器上极板带正电 B．若磁场正在减弱，则电场能正在增强，电容器上极板带正电 C．振荡电流的变化周期为：2π D．电场能量的变化周期为：π |
答案：A
| 请先阅读下面短文，掌握其大意，然后将下面方框的选项选择并还原到文章中，使短文意思通顺、结构完整。 | |
| Lucy is Jame's sister. She is good-looking with short hair. She doesn't have children. 1. She is only twenty-three. And she doesn't live in Britain. 2. She works in a travel agency (旅行社) in Rome. She doesn't get up early. She goes to work at 10:00 a.m. 3. She has a sandwich for lunch in a small restaurant. She goes home at 7:00 p.m. She likes her job, 4. On weekends, she visits her parents, 5.
|