在钨棒中加入钍、铈的目的是为了提高钨棒的()A.硬度 B.电子发射能力 C.熔点 D

题型:单项选择题

问题:

在钨棒中加入钍、铈的目的是为了提高钨棒的()

A.硬度

B.电子发射能力

C.熔点

D.导电性

考点:初级电焊工考试初级电焊工考试题库
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A: Hello, sir, may I talk with you in English?

B: Of course.

A: I have learned English at school for one year. I have very few chances to talk with the

    English-speaking people. 1. _____

B: Oh, you speak English very well.

A: Thank you. By the way, 2. _____

B: No, I'm not. 3. _____

A: How long have you been in this city?

B: 4. ____ 

A: I see. Do you like this city?

B: Yes. I like it very much. It's a beautiful city.

A: Thank you. 5. _____ 

A. are you a student from America?

B. Not good.

C. So I want to practice English.

D. I’ve lived here since three weeks ago.

E. I’m a student from Australia.

F. Do you like it?

G. I’m glad you like it.

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