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【单选题】
若单相桥式整流电容滤波电路中，变压器副边电压为有效值为10V，则正常工作时输出电压平均值UO (AV)可能的数值为（ ）。A.
14V
B.
12V
C.
9V
D.
4.5V
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【简答题】听力(共20小题,每小题1分,计20分) A)听对话回答问题(听两遍) 1.What is Alice's mother's job? A. B. C. 2.What is the boy going to do? A. B. C. 3.Which animal can help people? A. B. C. 4.When is Tom's birthday? A. B. C. 5.What ...
【简答题】听对话回答问题 1. How does the boy feel? A. Comfortable. B. Happy. C. Sad. 2. Which is the man's favourite animal? A. Tiger. B. Monkey. C. Panda. 3. What was Alan probably not good at when he was young? A. F...
【简答题】听对话,选择正确答案 1. What's the man's favorite animal? A. B. C. 2. What is the man's uncle like? A. B. C. 3. What's Andy's father's job? A. B. C. 4. Which sport is Leo good at? A. B. C. 5. How many students ...
【判断题】They have high expectations that whatever they want or can use "will be able to be tailoredto their own needs and wishes and desires."
A.
正确
B.
错误
【单选题】理想低通滤波器是( )
A.
物理可实现的
B.
非因果的
C.
因果的
D.
不稳定的
E.
:B
F.
程度:易
G.
:单选题
H.
满足傅氏级数收敛条件时,傅氏级数与原周期信号 的平均功率( )
I.
大于各谐波分量平均功率之和
J.
不等于各谐波平均功率之和 K. 小宇哥谐波分量平均功率之和 L. 等于各谐波分量平均功率之和
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