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【简答题】
如图3-33所示电路中，已知E=20V，R 1 =R 2 =R 3 =2kΩ，L=1H，C=10μF。电路原来处于稳定状态，t=0时闭合开关S。求初始值i L (0 + )，i C (0 + )，u c (0 + )，u L (0 + )。
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反馈参考答案：
举一反三
【判断题】I think the cost of annual meeting will burn a hole in our pocket . The underlined phrase means “The meeting unexpectedly costs a lot of money.”
A.
正确
B.
错误
【单选题】I doubt ____ he’ll take part in the annual meeting.
A.
How
B.
what
C.
that
D.
whether
【单选题】下列哪个素材平台,属于一次性付费终身免费使用的?
A.
昵图网： http://www.nipic.com/
B.
设计大学(大设天下)： https://shejidaxue.com/
C.
我图网： https://www.ooopic.com/
D.
汇图网： http://www.huitu.com/
E.
千图网： https://www.58pic.com/
【简答题】（）是第二次中规模最大的坦克战。
【单选题】听力原文：W: Hi. Tom. How things get along with the preparation for the annual meeting documents? M: It's coming along. But I've been staring at the computer screen for hours and my eyes hurt. W: Yeah Typi...
A.
Something goes wrong with his computer.
B.
He can not finish the documents in time.
C.
The computer screen is hurting his eyes.
D.
He can not understand the article.
【简答题】木材胀缩变形的特点是径向变化率最大，顺纹方向次之，弦向最小。
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