问题 单项选择题

某汽车零部件生产厂生产一批轴承,现要根据被检样本中的不合格产品数来推断是否接受整批产品,已知有两种计件抽样方案,方案甲为:n=10,Ac=0;方案乙为:n=20, Ac=0。请分析下列问题:

记乙方案OC曲线为L(p),比较L(0.05)和L(0.05)的大小结果为()。

A.L(0.05)>L(0.05)

B.L(0.05)乙(0.05)

C.L(0.05)=L(0.05)

D.L(0.05)=2L(0.05)

答案

参考答案:A

解析:

单项选择题
写作题

书面表达。

     假如你是某家英文报社的编辑,昨日收到一位中学生读者王丽的来信。请根据来信内容和所给

的要点提示用英语写一封回信。词数100左右。 

Dear Editor,

     I am a hard-working girl and want to be the number one in my class. But in the exams, I always make

mistakes that I should have avoided. I really worry about it. What can I do to improve my performance in

exams?

                                                                                                                                         Wang Li

      提示:(1) 不要压力太大; 

                (2) 如有问题,请教老师或同学;

                (3) 考试时合理分配时间并尽量抽出几分钟检查。

      注意:(1) 可以适当增加细节以使行文连贯; 

                (2) 书信的开头和结尾已给出,但不计入总词数。

                参考词汇:分配 distribute

Dear Wang Li,

     It's good that you know what prevents you achieving satisfying scores in exams. 

     ___________________________________________________________________________________

______________________________________________________________________________________

                                                                                                                                              Editor