问题 问答题

如何发现存在系统误差?

答案

参考答案:

①在规定的测量条件下多次测量同一个被测量,从所得测量结果与计量标准所复现的量值之差可以发现并得到恒定的系统误差的估计值。

②在测量条件改变时,例如随时间、温度、频率等条件改变时,测量结果按某一确定的规律变化,可能是线性地或非线性地增长或减小,就可以发现测量结果中存在可变的系统误差。

单项选择题
完形填空

阅读短文,根据每小题的具体要求回答问题。请将答案写在答题卡上的规定位置。(共5小题;每小题2分,满分10分)

Ashley Power’s mother bought a computer for her when she was eight. When she was thirteen, she was surfing the Internet regularly, but she couldn’t find anywhere for teenagers to meet and talk. And one day she thought, “If I had my own website, I’d make it a really interesting site for teenagers.”

  So, when Ashley was sixteen, she launched her own website, called Goosehead. She had no idea how big a success it would be, but three years later, the site was the most successful teen site in the USA! It was getting 100,000 hits every day, and Ashley had about 30 employees.

  After a few years, the website closed down. Then Ashley, who lives in Los Angeles, was asked to write a book called The Goosehead Guide to Life. The book is about how to design a website and start a business. It begins with a section called “All About Ashley,” where Ashley tells readers what it is like to be the boss of a company when you are only sixteen. “I was so happy. But it was crazy in a lot of ways. I got very stressed. I mean, I was only sixteen—I didn't even have a car! If you were sixteen and you had your own company, you'd be stressed, too!”

In an interview Ashley gave advice to teenagers who wanted to start their own business, “Just be strong and have your dreams and work hard at them. And don't listen when _______, because I heard 'no' a lot. Just keep going until you hear 'yes'!”

小题1:For what purpose did Ashley create GooseHead?  (no more than 10 words)

小题2:What is the main idea of Paragraph 2?  (no more than 6 words)

小题3:According to Paragraph 3, what did Ashley do after GooseHead closed down?  (no more than 10 words)

小题4:How did Ashley feel as a young boss of a company?  (no more than 5 words)

小题5:Fill in the blank in Paragraph 4 with proper words.  (no more than 10 words)