测量氧化锌避雷器1mA直电流时的电压，即氧化锌避雷器通过1mA直流电流时所施加的电压
题型：判断题
问题：
测量氧化锌避雷器1mA直电流时的电压，即氧化锌避雷器通过1mA直流电流时所施加的电压，称之为临界动作电压。
题型：判断题
---What’s the matter with you, Tom?
---Oh, 1 Maybe I’ve got a cold．
--- 2 Why don’t you take some cold stop?
--- 3
--- That’s what I too
k the last time I had a cold． 4 Maybe that’ll help．
---Thanks．
（Two days later ）
---How are you feeling now?
---Getting better．
--- 5
A．Does it work well?
B．Good idea．
C．Glad to hear it．
D．I feel a little bad under the weather now．E．It worked pretty well．
F．It’s very kind of you．
G．That’s too bad．