正态分布的位置参数是A.SB.μC.PD.uE.t

题型:单项选择题

问题:

正态分布的位置参数是

A.S
B.μ
C.P
D.u
E.t

考点:口腔执业医师口腔执业医师
题型:单项选择题

阅读下面短文,简要回答所给问题。

The first telephone cards, produced in 1976, were Italian. Five years later the first British card appeared, and now you can buy cards in more than a hundred countries. People usually start collecting cards because they are small and light and you do not need much space for them. It is also a cheap hobby for beginners, although for some people it becomes a serious business. In Paris, for example, there is a market where you can only buy telephone cards, and some cards cost up to £4,000. The first Japanese card has a value of about £28,000. Most people only see cards with prices like these in their collectors’ magazine.

小题1:When were the first Italian telephone cards produced?  _________________________________________________

小题2:How many countries can produce telephone cards now?  _________________________________________________

小题3:Where can we find a market to buy telephone cards?

_________________________________________________

小题4:What is the price of the first Japanese telephone card?

_________________________________________________

小题5:In which magazine do most people see cards with prices?

_________________________________________________

题型:单项选择题

从北京到广州沿京广铁路依次经过我国的哪几个温度带?哪几个干湿地区?哪些主要地形区?哪些省会城市?

________________________________________________________________________________________________________________________________________________________________

题型:单项选择题

1927年到l936年,中国的GDP飞速增长,9%的增长速度是同期日本的三倍。这一时期中国经济迅速发展的原因是

A.西方因经济危机放松对中国的经济侵略

B.苏联对中国进行经济援助

C.新兴工业如化学工业等大量建立

D.国民政府开展国民经济建设运动

题型:单项选择题

细胞膜内外正常的Na+和K+浓度差的形成和维持是由于()

A.膜在安静时对K+通透性大

B.膜在兴奋时对Na+通透性增加

C.K+易化扩散的结果

D.膜上Na+K+泵的作用

E.Na+易化扩散的结果

题型:单项选择题

在起重机上多用线接触钢丝绳,其使用寿命比点接触钢丝绳长()倍。

A.30-40

B.20-30

C.10-20

D.1-2

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