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确定围堰高度的方法是()。
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商业银行一般产品销售人员通过“个人理财”从业资格考试后，可以向客户提供理财投资咨询顾问意见和销售理财计划。()
Liberia's history has been marked by______.
下图中f(t)表示故障密度函数，则下列说法正确的是()。
听力原文：W: Hello. What's all this then, Harry？
M: What's all what？ I'm making a cake.
W: Yes. We can see what you're up to. Obviously you're making a cake. What else would you be doing with a cake tin and a rolling pin on the table and the place absolutely covered in flour？ Yes, we can see what you're doing. But why are you doing it？
M: Well, I just decided I'd try and make one for a change instead of buying one. Anyway this is going to be a rather special sort of cake. You can't buy them like this. And while you're here, Doris, do you mind beating up half a dozen eggs in that blue bowl over there？ You'll find a fork and egg whisk, whichever you prefer, in the drawer on the left.
W: OK. I don't mind. But what's so special about this cake？
M: It's a surprise cake.
W: A surprise cake？
M: Yes. Doris, don't forget to add five spoons of sugar.
W: No, dear. But tell us about this surprise cake.
M: Well, it was an idea I had while I was lying in bed last night.
W: Do you usually think of food in bed？
M: I wasn't thinking of food. I decided to have a party for some old friends of mine, but I want to give them a surprise.
W: What kind of surprise？
M: Can you add a half of a pint of cream to that, Doris？ That's right, drip it in slowly and then beat it up again until it becomes all sticky. That's the way.
W: I have made a cake before, you know. Now, come on, what's the surprise？
M: Well, it's quite simple, really. You see, I serve the cake with candles on it. Then I switch out the lights and I slip out of the room. But before this I tell them that they must count to twenty before trying to blow out the candles and they'll get a surprise.
W: And then？(Explosion effect)
(20)
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