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问题 判断题

产生焊接电弧的必要条件是介质电离成导体，并且阴级连续不断地发射电子。

答案

参考答案：错

单项选择题

What will the woman do on Thursday
[A] She is going to the cinema with the man.
[B] She is going to do her English homework at home.
[C] She is going to stay in the library.
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多项选择题

常用的差错检验方法有哪些（）。

A.奇偶校验

B.方块校验

C.网络校验

D.循环冗余校验
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