无电涌出现时为高阻抗，当出现电压电涌时突变为低阻抗。通常采用_爱下问搜题

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问题单项选择题

无电涌出现时为高阻抗，当出现电压电涌时突变为低阻抗。通常采用放电间隙、充气放电管、闸流管和三端双向可控硅元件做组件的SPD称作（）。

A、电压开关型SPD

B、限压型SPD

C、限流型SPD

D、组合型SPD

答案

参考答案：A

名词解释

白皮松

填空题

用方框所给词的适当形式填空。

hard, busy, danger, bore, interest

1. It's very_____ to play football on the busy street.
2. The workers are making the shoes_____.
3. I don't like to watch the_____ match.
4. Science is too_____ for him. He is not good at it at all.
5. That is a very_____ story.