下列哪项是引起胃食管反流的主要原因?() A.一过性食管下括约肌松弛 B.胃排空延迟

题型:单项选择题

问题:

下列哪项是引起胃食管反流的主要原因?()

A.一过性食管下括约肌松弛

B.胃排空延迟

C.裂孔疝

D.腹水

E.呕吐

考点:消化内科学(医学高级)医学高级押题密卷消化内科特训密卷五(副高)
题型:单项选择题

下列说法正确的是(  )

A.在电场中某点不放检验电荷,该点的电场强度为零

B.正电荷从A点移到B点,电场力做正功,A点电势一定较高

C.由场强的定义式E=F/q可知,电场中某点的E与q所受的电场力F成正比

D.电荷在电场中某点所受电场力的方向即为该点的电场强度方向

题型:单项选择题

支付结算是一种要式行为,即必须依照一定形式进行的行为。( )

题型:单项选择题

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

     Taking good notes is a time-saving skill that will help you to become a better student in several ways.

1_____ Second, your notes are excellent materials to refer to when you are studying for a test. Third,

note-taking offers variety to your study time and helps you to hold your interest.

     You will want to take notes during classroom discussions and while reading a textbook or doing research

for a report. 2_____ Whenever or however you take notes, keep in mind that note-taking is a selective

process. 3_____ 

     The following methods may work best for you.

     · Read the text quickly to find the main facts and ideas in it.

     · Carefully read the text and watch for words that can show main points and supporting facts.

     · Write your notes in your own words.

     · 4_____

     · Note any questions or ideas you may have about what was said or written.

     As you take notes, you may want to use your own shorthand (速记). When you do, be sure that you

understand your symbols and that you use them all the time. 5_____

A. Use words, not complete sentences.

B. There are three practical note-taking methods.

C. You must write your notes on separate paper.

D. Otherwise, you may not be able to read your notes later.

E. You will also want to develop your own method for taking notes.

F. That means you must first decide what is important enough to include in your notes.

G. First, the simple act of writing something down makes it easier for you to understand and remember it.

题型:单项选择题

奥苏伯尔按学习的发生方式将学习的发生分为______。

A.发现学习

B.机械学习

C.接受学习

D.有意义学习

题型:单项选择题

多数黄酮类化合物的基本母核为()

A.3-苯基色原酮

B.色原酮

C.色满酮

D.2-苯基色满酮

E.2-苯基色原酮

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