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问题 单项选择题

在正态分布中心无偏移情况下，西格玛水平Z0为3时，其特性落在规范限内的百分比是（）。

A、68.27%

B、95.45%

C、 99.73%

D、99.9937%

答案

参考答案：C

单项选择题

Welcome to the Grand Center--the place for all the family


If you like sports, go to the sports center on the twenty-eighth floor. On the twenty-eighth floor, we have a ping-pong room. If you like films, go to the twenty--seventh floor and watch a film in the ABC Cinema.
If you like to eat, there are a lot of places in the Grand Center for you to go to. You can try Wonderful Restaurant. That’s a new restaurant on the twenty-first floor. Crazy Town ( a Sichuan restaurant)is on the twenty-third floor and there’s an American restaurant on the twenty-sixth. But don’t worry, children ! If you like other kinds of foreign food, you can go to the coffee shop on the first floor. It’s really great.
If you like to shop, there are the twelfth to the nineteenth floors. On the twelfth floor, for example, there’s AST World for computers and computer games. There’s a big store on the fifteenth floor for radios, TVs and CDs. And the nineteenth floor has sports stores and a supermarket.

Which is open all night
[A] Crazy Town． [B] AST World． [C] Rose Hall．

And there’s Rose Hall for all you dance people ( for people over 14 years old). That’s on the top floor, of course. You can dance and sing all night.
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选择题

关于物理学思想方法，下列说法中正确的是（     ）

A．著名的伽利略斜面实验，主要应用了控制变量方法

B．在定义“速度”、“加速度”等物理量时，主要应用了比值的方法

C．在研究加速度和外力、质量的关系时，主要应用了等效替代的方法

D．在研究气体的温度不变时，压强与体积的关系时，主要应用了理想实验方法
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