下列哪一药物具有中枢性降压作用，且不减少肾血流： A．胍乙啶_爱下问搜题

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问题单项选择题

下列哪一药物具有中枢性降压作用，且不减少肾血流：

A．胍乙啶
B．利舍平
C．呋塞米
D．甲基多巴
E．可乐定

答案

参考答案：D

填空题

将下列单词或词组填入空格。每空限填一词，每词只能填一次

A. weak B. break C. confident D. at the end of
E. possibly F. breath ' G. do well in H. hobbies I. politely

A headmaster is giving a speech about how to perform successfully in an interview to a
new school.

Interviews are held so that you can learn about the school and the school can learn about you. You should spend a couple of hours getting ready for the interview carefully. Then you will    小题1:   understand your questions better and get right answers on the day of the interview.
First find out about the school. Read the school introductions and look at the school websites. Then think about yourself- your strong points and    小题2:   ones. Try to find a few examples you could give the interviewers.
What else you want to tall the interviewer about yourself?. For example, you might want to speak about your interests and   小题3:   outside school. These tell the interviewer what kind of person you are. Be ready to talk about why you enjoy them.
Dress properly on the day. Arrive a few minutes early. When you first meet the interviewer, greet him or her    小题4:  . Don't forget to smile and make eye contact. First impressions (印象) are very important. You want the interviewer to think you are     小题5:  and friendly.
If you get nervous, take a deep    小题6:   to calm yourself down. Listen to the interviewer with great care. If you don't understand the question, ask the interviewer to repeat it. Last but not least,    小题7:   the interview, don't forget to thank the interviewer and say goodbye.
I'm sure that you will    小题8:   your interviews. Best of luck, boys and girls!

单项选择题

在活塞式压缩机的实际工作过程中，由于排气需要克服气阀弹簧的阻力，所以，只有当蒸气压缩到气缸内的压力（）排气管腔处的压力时，排气过程才能进行。

A.低于

B.等于

C.高于

D.等于或高于