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试验误差的来源及其控制途径？

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试验设计的基本原则？

什么情况下需使用裂区设计？应用裂区设计时应注意什么问题？

[音频]A: Hi, Katia, how are you?K: I’m doing good, and you Alex?A: I’m doing good. Thank you. I have a question for you. Are you on Facebook?K: Yes, I’m on Facebook. But I really do not check it very often.A: OK. How often do you check usually?K: Em… I actually try not to check it very often. It’s been taken a lot of my time. So right now I check it about… I try __________ during the weekends.A: OK. I used to be on Facebook a lot before. But then I realize that I was losing _on it, and I kind of decide to close my wall. But I don’t know if that’s the right thing, because sometimes I feel that I need to communicate stuff with my friends.K: It really has become an_, hasn’t it? You can get lost from what is actually happening around you and live in a virtual world. I believe that it should be handled differently than it has up tonow so maybe you’re doing good by closing or, you know, _________________ at least.A: Yeah.K: But how much, that you might have to consider.

稻作文化的特质有什么？