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试验设计的基本原则？

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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.

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K: Are your parents on any social sites like Facebook, Tweeter?A: My mom and dad are on Facebook. And my mom Twieeter ________ I did.K: Oh really?A: I still don’t have Twieeter. She got it for her _. She’s working as a chief medical officer soshe got it for her company.K: How do you __________ having your parents on these social media sites?A: You[音频]know, Facebook, I don’t know. I think it’s a bit _honestly. There’s some stuff on there;it’s for my friends. It’s not really for them, so I don’t know. I feel it can be a bit awkward.