核外DNA主要有______、______和______。

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问题填空题

答案

参考答案：线粒体DNA；叶绿体DNA；质粒DNA

改错题

单句改错
1. My uncle has become a Party member for ten years. 2. Have you gone to the Great wall? 3. -Who likes maths in your class? -None. 4. Mr. Zhang reached two hour ago.	____________________ ____________________ ____________________ ____________________

单项选择题

中性点经消弧线圈接地的运行方式，在实践中一般采用（）。

A.欠补偿

B.过补偿

C.全补偿

D.恒补偿