导致近交衰退的原因是()。
A、出现影响繁殖性能的现象
B、个体发育中对环境适应性降低
C、个体纯合位点增加,隐性有害基因暴露
D、产生新的有害基因突变
参考答案:C
根据汉语提示完成对话。
Mike: What are you going to do 1_____________ (放学后)?
John: I'm going to buy some books. Where is the 2_____________ (书店)?
Mike: It's next to the 3_____________ (邮局).
John: How can I get to the post office?
Mike: You can go by the 4_____________ (1路公共汽车). Get off at the 5_____________ (图书馆).
Then walk straight for ten minutes. The bookstore is on the right.
John: Thank you.
35kV等电位作业人员对接地体的距离应不小于0.4m。