问题 单项选择题

某团队在进行离散型数据的测量系统分析,抽取30件产品,由3个测量员对每件产品重复测量2次,记录其合格与不合格数目。关于样本取样团队成员发表了各自的意见,请问以下说法正确的是()

A.根据实际生产的不良率,选择成比例的合格及不合格样品

B.至少10件合格,至少10件不合格,这与实际生产状态无关

C.设定某一比率现场抽取合格零件与不合格

D.以上说法均不正确

答案

参考答案:B

改错题

短文改错。

There have be a lot of changes since World                                        1._____

WarⅡ. But perhaps a biggest change is                                              2._____

the telephone. People no longer write

letters for one another. They pick up the                                             3._____

telephone. Every house has at least two,

sometimes three, four and five telephones.                                          4._____

 Every office has many telephones. There

have more telephones than people in                                                   5._____

American. My little house has three                                                    6._____

phones. In the morning the first thing

which wakes me is my telephone ring.                                                7._____

Long distance telephone call are very                                                 8._____

cheap before seven o'clock in the morning.

So that my friend in Boston telephones me                                           9._____

to say “Good morning.” If you never have

 to write a letter, you simple take up the                                              10._____

telephone and say what you want to say.

单项选择题 A1型题