正常食管下端,防止胃一食管反流的作用机制哪几项是对的() A.锐利的食管胃角,在胃压

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问题:

正常食管下端,防止胃一食管反流的作用机制哪几项是对的()

A.锐利的食管胃角,在胃压力作用下使贲门关闭

B.横膈的张力和弹性作用,深吸气时裂孔缩小

C.在腹腔内压力作用下,胃食管前庭使食管裂孔管壁紧密靠拢

D.贲门部黏膜在贲门关闭时凸向胃腔,起防止反流活瓣作用

E.以上都是

考点:广西住院医师基础知识基础知识题库
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将下面的字母重新排列,组成一个学过的单词。

1. k e n e     2. t o h     3. n o e s     4. f t o o     5. d n a h     6. b d o y

                                                                                                       

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芦荟的主治病证是()

A.热结便秘

B.水肿臌胀

C.烦躁惊痫

D.小儿疳积

E.癣疮

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Motivation is "the driving force within individuals that impels them to action." And goals are the sought-after results_____(1) motivated behavior.Motivation can be either positive or negative_____(2) direction. We may feel a driving force toward some object or condition, _____(3) a driving force away from some object or condition. For example, a person may be impelled toward a restaurant to fulfill a need, hunger, and away_____(4) an airplane to fulfill a need of safety. Some psychologists refer to positive drives_____(5) needs, wants or desires,_____(6) negative drives as fears or aversions._____ (7), though negative and positive motivational forces seem to differ dramatically_____(8) terms of physical and sometimes emotional activity, they are basically similar in_____(9) they both serve to initiate and sustain human behavior.____(10) this reason, researchers often refer _____(11) both kinds of drives or motives as needs, wants and desires.Goals, _____(12), can be either positive or negative. A positive goal is one toward_____ (13) behavior is directed and it is often referred to as an approach object. A negative goal is _____(14) from which behavior is directed away and it is sometimes referred to as an avoidance object. Since both approach and avoidance goals can be considered objectives of motivated behavior, most researchers refer to_____(15) types simply as goals. Consider this example. A middle-aged woman may wish to remain_____(16) attractive as possible. Her positive goal is to appear desirable, and_____(17) she may use a perfume advertised to make her irresistible. A negative goal may be to prevent her skin_____(18) aging, and therefore she may buy and use face creams._____(19) the former case, she uses perfume to help her achieve her positive goal — attractiveness; in the____(20) case, she uses face creams to help avoid a negative goal — wrinkled skin.

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环境质量标准可以分为哪两类?

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高速切削机床和普通数控机床的区别:

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