判断题

感应加热表面淬火，淬硬层深度取决于电流频率；频率越低，淬硬层越浅；反之，频率越高，硬层越深。

答案：正确

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单项选择题

Which of the following is a mixed constructure? A.
Becuase I am confused on all the important issues is why I don't attend church regularly. B.
I don't attend church regularly because I am confused on all the important issues. C.
Neither of the above. D.
Both of the above.

The sentence "Has the nurse slept the baby yet?" is ungrammatical.

答案：正确