离心式压缩机为什么有那么高的转速?

题型:问答题 简答题

问题:

离心式压缩机为什么有那么高的转速?

考点:压缩机工考试空压站压缩机初级工空压站压缩机初级工题库
题型:问答题 简答题

The editor gives Cindy some           . [ ]

A. advices and help

B. advice and helps

C. advices and helps

D. advice and help

题型:问答题 简答题

根据以下资料回答题

2011年,某农场棉花生产中的某些经济参数如下表所示:

根据上述资料,回答下列问题。

2011年该农场肥料成本超支()元。

A.286

B.316

C.326

D.425

题型:问答题 简答题

阅读理解。

     Many people turn to the web for health advice. Women use the Internet to look for health information

for themselves and their family significantly more than men, research has found. The study, by independent

research company Datamonitor, says that for this reason health sites should make greater efforts to appeal

to women by covering their health concerns.

     The researchers, who quizzed 4,531 adults across France, Germany, Italy, Spain, the UK and the US,

found that websites have become just as important as some off-line sources of health information. Fifty-seven

percent of those who looked for health information in the past 12 months consulted Internet sources.

     Report author Yvonne MacPherson said,"A distinct advantage of the Internet as a source of health

information is that information is easily accessible and can be read in private and at the leisure of the Internet

user." "Good health sites are not meant to replace interaction with a physician. Rather, they help patients

prepare for appointments and take more responsibility for their health." He added.

     Currently, 32-34% of adults aged 18 to 54 used the Internet to search for health information. This number

decreases to 27% in the 55 to 64 age group, and further to 14% in the 65 and over age group. Young Internet

users often conduct online health research on behalf of older family members who do not use the Internet.

     However, Datamonitor says that the audience for health information online will grow naturally as the

population ages, and more and more people grow up with the net. It recommends that website operators

focus their efforts on building a good long-term relationship with their existing consumers, rather than on

attempting to attract non-Internet users.

1. What is the main subject discussed in the passage?

A. The popularity of health websites.

B. The importance of health advice.

C. The advantage of the Internet sources.

D. The increase of people's health concerns.

2. According to Yvonne MacPherson, health information online could be described as ______.

A. acceptable

B. convenient

C. accurate

D. abundant

3. Which of the following is NOT true?

A. Health websites should pay more attention to women's health concerns.

B. A good health site should be able to replace interaction with a doctor.

C. The old tend to make less use of the Internet for health information.

D. The young may be the potential audience of health information online.

题型:问答题 简答题

有关慢性支气管炎诊断标准,咳嗽、咳痰反复发作时间应为()

A.每年发作至少3个月,持续10年以上

B.每年发作至少1个月,持续2年以上

C.每年发作至少2个月,持续3年以上

D.每年发作至少3个月,持续2年以上

E.每年发作至少6个月,持续4年以上

题型:问答题 简答题

分别解释需求层次理论和双因素理论在消费者购买行为方面的应用。

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