触头间恢复电压是指触头间电弧（）后外电路施加在触头之间的电压。
A.重燃
B.彻底熄灭
C.暂时熄灭
参考答案：C
把图片与其对应的名词搭配起来。
1. 2. 3. 4.
( ) ( ) ( ) ( )
A. America B. UK C. Canada D. China
看图，完成对话。
Betty: Hi. Jim ! 1 that?
Jim: It's a 2 3 my family.
Betty:Oh, can I see it?
Jim: OK!
Betty: Is this your father, Jim?
Jim: Yes, 4 5 .
Betty: And is this your 6 ?
Jim: Yes, it 7 17 . She is my mother.
Betty: And is this your 8 ?
Jim: No, 9 10 . She is my cousin.
Betty: 11 her name?
Jim: Cissy.
Betty: 12 do you 13 it?
Jim: C-I-S-S-Y.
Betty: What's 14 15 name?
Jim: White.
Betty: 16 you. Jim.
Jim:That's OK.
2.
3.
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