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整样抽样的特点有
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现况研究中，常见的随机抽样方法有
[音频]S= Sellelr C= CustomerS: Good morning. ___________________?C: Good morning. Would you show me some typical Chinese souvenirs? I’d like to buy a gift formy wife.S: We’ve got plenty of silk scarves and silk dresses for you to choose from.C: The dress is very nice. _______________ is it ?S: Fifty-five US dollars.C: It’s a little more than I expected. Could you give me a _______________?S: I’d like to, but I’m afraid I can’t. You see, it’s already 5% off the regular price.C: Then I’m _________ I can’t afford it.S: Well, let me ask the manager if it’s all right… I’m sorry to have kept you waiting. The best wecan do is to give you a 10% discount.C: OK. I’ll _________.
[音频]R=Receptionist M=Michael HanR: Good morning! Welcome to Holiday Hotel. What can I do for you?M: I have a ________________ with you.R: May I have your name, please?M: Michael Han.R: Let me check. Yes, there it is. A double room for one night. Mr. Han, may I have a _______ at yourpassport, please?M: OK, here you are.R: Would you please __________ the registration form?M: All right. What’s the rate for one person per night?R: 59 dollars.M: Do you accept traveler’s checks?R: Sure. Here is the key card to room 3316. The bell-man will show you the way.M: Thanks. I will be leaving tomorrow. When shall I ____________out ?R: Any time before 11:00 a.m.M: All right. I’ll remember that.
若连续函数在闭区间上有惟一的极大值和极小值,则( )
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