螺杆泵出现泵抽空现象有何危害?

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问题:

螺杆泵出现泵抽空现象有何危害?

考点:采油工考试采油工应知应会采油工应知应会题库
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King’s College Summer School is an annual (年度的) training program for high school students at all levels who want to improve their English. Courses are given by the teachers of King’s College and other colleges in New York. Trips to museums and culture centers are also organized. This year’s summer school will be from July 25 to August 15. More information is as follows:
Application date
▼ Students in New York should send their applications before July 18, 2013.
▼ Students of other cities should send their applications before July 16, 2013.
▼ Foreign students should send their applications before July 10, 2013.
Courses
▼ English Language
Spoken English: 22 hours
Reading and Writing: 10 hours
▼ American History: 16 hours
▼ American Culture: 16 hours
Steps
▼ A letter of self-introduction
▼ A letter of recommendation(推荐)
The letters should be written in English with all necessary information.
Cost
▼ Daily lessons: $200
▼ Sports and activities: $100
▼ Travel: $200
▼ Hotel service: $400
You may choose to live with your friends or relatives(亲属) in the same city.
Please write to: Thompson, Sanders
1026 King’s Street, New York, NY10016, USA
E-mail to:     KC-Summer School @ yahoo.com
小题1:The summer training program includes all of the following except ______.
A.doing a part-time jobB.taking courses
C.having sportsD.travelling
小题2:If you want to live at a relative’s home in New York, you will have to pay the school ______.
A.$ 200B.$ 400
C.$ 500D.$ 900
小题3:Which of the following statements is True?
A.The program will last two months.
B.You can e-mail or call the school.
C.You should write to Thompson only in English.
D.Students in China can send applications only on July 10.
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该药物的主要作用机制是

A.抑制转肽酶

B.抑制DNA回旋酶

C.作用于核糖体50s亚基,抑制蛋白质合成

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特种作业人员有()情形之一的,复审或者延期复审不予通过。

A、健康体检不合格的

B、超过特种作业操作证有效期未延期复审的

C、违章操作造成严重后果或者有2次以上违章行为,并经查证确实的

D、特种作业操作证记载虚假信息的

E、未按规定参加安全培训,或者考试不合格的

题型:问答题 简答题

DSS有许多特点,以下关于DSS的论述中错误的是【 】。

A.DSS面向决策者,为决策者服务

B.DSS在决策过程中代替人的决策

C.DSS体现决策过程的动态性

D.DSS提倡交互式处理

题型:问答题 简答题

有些高大的乔木,根部吸收的水分可以向上输送到植物的顶部,其主要动力来自(  )

A.光合作用

B.输导作用

C.蒸腾作用

D.呼吸作用

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