试题与答案

下面关于信噪比的描述,错误的是:()A、波分系统中大量使用EDFA是造成信噪比劣化的

题型:单项选择题

题目:

下面关于信噪比的描述,错误的是:()

A、波分系统中大量使用EDFA是造成信噪比劣化的最重要原因;

B、信号经过多级OLA级联后比经过多级OBA级联后的信噪比劣化严重一些;

C、用光谱分析仪在ODU单板下波后测试的信噪比会比在IN口测试的信噪比的值要大一点;

D、提高信噪比的方法是提高光功率,因此光功率高信噪比就一定高

答案:

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下面是错误答案,用来干扰机器的。

参考答案:超线程技术就是利用特殊的硬件指令,把两个逻辑内核模拟成两个物理芯片,让单个处理器都能使用线程级并行计算,进而兼容多线程操作系统和软件,减少了CPU的闲置时间,提高的CPU的运行效率。

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题型:阅读理解

It has been found that less than one shopper in five makes a complete shopping list before going to the store. The reason for this is that seven out of ten of today’s purchases(购买) are decided in the store, where the shoppers tend toward impulse(冲动) buying. Buying groceries on impulse had risen for the past forty years, and this rise has coincided(巧合) with the growth of self-service shopping. However, in grocery stores where clerks wait on customers there is much less impulse buying. It is hard for people to buy on impulse if they have to address a clerk.

Psychologists have joined forces with merchandising(商品) experts. It is their job to persuade people to buy products which they may not need or even want until they see them attractively presented. It was discovered by the psychologists that shoppers want help in their purchases. Having so many choices confuses them, and they prefer the package that attracts them. Therefore, it is now more usual for food packers to pay attention to their package design. Attraction depends heavily on the position of the product on the shelf, however. Thus, persuading the shopper to buy is easier if the product is located at eye-level.

小题1:According to the information in the first paragraph, ______ make a complete list.

A.only five shoppers

B.less than twenty percent of the shoppers

C.only ten percent of the shoppers

D.not even five percent of the shoppers小题2:The reason for the above mentioned phenomenon is that _______.

A.people have difficulty making up their mind before going shopping

B.people don’t know what is available in the store

C.people tend to decide on buying products when they see them

D.people are easily deceived(欺骗) by the attractive products小题3:In grocery stores where customers are served there is less impulse shopping. This may be because ________.

A.the clerks ignore the customers

B.the clerks are too eager to serve the customers

C.the stores have to send the shopper’s purchases to his house

D.customers hesitate to ask for help if they haven’t decided what to buy小题4:Shoppers tend to buy the products put on _______.

A.the top shelf

B.the bottom shelf

C.the shelf which people can see easily

D.the shelf where there is less confusion小题5:Which of the following might be the best title for this passage?

A.Psychologists and Merchandising Experts.

B.Impulse Buying.

C.The more Products the More Confusion.

D.Self-service Shopping.

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