搜题请搜索小程序“爱下问搜题”
问题 单项选择题

单纯性二尖瓣狭窄的病变不伴有

A．左心房肥厚

B．左心房扩张

C．右心室肥厚

D．左心室肥厚

E．心脏呈梨形

答案

参考答案：D

解析：单纯性二尖瓣狭窄可致左心房扩张、左心房肥厚和房内压升高，依次引起肺静脉和肺毛细血管压力升高，导致肺淤血，进而可发展为肺动脉高压和右心室肥大，使心脏呈梨形，但不伴有左心室肥厚。

单项选择题

Anthropology is the study of human beings as creatures of society. It (1) its attention upon those. physical characteristics and industrial techniques, those conventions and values, which (2) one community from all others that belong to a different tradition.

The distinguishing mark of anthropology among the social sciences is that it includes for serious study other societies (3) our own. For its purposes any social (4) of mating and reproduction is as significant as our own. To the anthropologist our customs and those of a New Guinea tribe are two possible social schemes for (5) a common problem, and in so far as he remains an anthropologist he is (6) to avoid any weighting of one (7) the other. He is interested in human behavior, not as it is shaped by one tradition, our own, but as it has been shaped by any tradition (8) He is interested in a wide (9) of custom that is found in various cultures, and his object is to understand the way in which these cultures change and (10) , the different forms through which they express themselves and the (11) in which the customs of any peoples function in the lives of the (12) .

Now custom has not been commonly regarded as a (13) of any great moment. The inner workings of our own brains we feel to be uniquely (14) of investigation, but custom, we have a way of thinking, is behavior at its most commonplace. (15) , it is the other way round. Traditional custom is a mass of detailed behavior more astonishing than (16) any one person can ever evolve in individual actions. Yet that is a rather (17) aspect of the matter. The fact (18) first rate importance is the predominant role that custom (19) in experience and belief, and the very great varieties it may (20)

7（）

A. in favor of

B. instead of

C. rather than

D. in contrast with
查看答案
单项选择题

在道路货物运输组织中，______组织方式体现了平行作业的基本原理。

A．双班运输
B．拖挂运输
C．甩挂运输
D．定时运输
查看答案