题目内容

A: Hey, Henry! What are you doing?B: I have been trying to solve this math problem for the last half hour, and I still (1)_____ how to do it.A: When do you have to turn it in?B: It is (2) at the end of this week.A: Well, it is only Monday. Why don’t you get some (3) from Professor White tomorrow?B: OK, I will do that. Thanks for your suggestion.

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二极管的文字符号（）

A
B
C
D

二极管加反向电压后，外电场的方向与内电场的方向相同，空间电荷区（）。

A. 变窄
B. 不变
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二极管电路符号中箭头一边代表（）极，竖线一边代表（）极。

一般硅二极管的管压降约为（）V，锗二极管约为（）V。