题目内容

死区电压是指在二极管应用在具体的电路中时，由于本身的压降，也就是供电电压小于一定的范围时不导通，造成输出波形有残缺，从供电电压经过零点直到输出波形残缺消失的时候，这一段电压就是死区电压。

A. 对
B. 错

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若加在二极管上的反向电压超过击穿电压值，则二极管会损坏。

A. 对
B. 错

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二极管导通后的管压降很小，硅管约为0.7V。

A. 对
B. 错

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Listen to the customer enquiries below that take place at a checkout area. Read the three possible cashier responses for each enquiry. Which is the correct response? Choose your answers.1. Customer:Cashier:[音频]

A. I'll put them back on the racks for you. Sorry they didn't fit.
B. I'm sorry, we only accept cash or credit card.
C. Sure, we can hold them for you for three days.

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2. Customer:Cashier:[音频]

A. Sure. They're $50 regular. So today they're $25.
B. Please grab a pair from the shelf that has a price sticker.
C. No you don't have to buy both pairs to get the discount.

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死区电压是指在二极管应用在具体的电路中时，由于本身的压降，也就是供电电压小于一定的范围时不导通，造成输出波形有残缺，从供电电压经过零点直到输出波形残缺消失的时候，这一段电压就是死区电压。

A. 对 B. 错

若加在二极管上的反向电压超过击穿电压值，则二极管会损坏。

二极管导通后的管压降很小，硅管约为0.7V。

Listen to the customer enquiries below that take place at a checkout area. Read the three possible cashier responses for each enquiry. Which is the correct response? Choose your answers.1. Customer:Cashier:[音频]

2. Customer:Cashier:[音频]

A. 对
B. 错