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触发器可以根据触发事件分、和触发器。

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Replace the underlined words with the correct form of the words given below.1. When he speaks, people notice that he sounds Irish.2. Frank McCourt had read a lot of books, which was deserving of respect considering he had no high school education.3. You can tell the students on the underground trains by the books they carry.4. The woman in the admissions office suggests that his European education is not good enough.5. The professor was writing very quickly in his notebook.6. Many immigrants came to America to escape extremely bad treatment because of their race, religion or political beliefs in their own countries.

纯净且晶格完整的半导体称为（）。

高纯度的单晶（）和（）属于典型的本征半导体。

单晶硅原子最外层有（）个价电子。