问题 问答题 简答题

轴流压缩机工作原理是什么?

答案

参考答案:

当叶轮旋转时,气体从进风口轴向进入叶轮,受到叶轮上动叶片的推挤而使气体的能量升高,然后流入导叶。导叶将偏转气流变为轴向流动,同时将气体导入扩压管,进一步将气体的动能转化为压力能,最后引入工作管道。轴流风机的叶片一般都是可以转动角度的,大部分轴流风机都配有一套叶片液压调节装置,当风机运行时,通过叶片液压调节装置可调节叶片上的角度,改变压力能,并保持在一定角度上,使其在变工况工作时具有较高的效率。

单项选择题 共用题干题
单项选择题

Social control refers to social processes, planned or unplanned, by which people are taught, persuaded, or forced to conform to norms. In every society, some punishments or negative sanctions are established for deviant behavior. Without deviant behavior there would not be need for social control and without social control there would not be a way of recognizing the boundary between the acceptable and the unacceptable.

Social control may be either formal or informal. Informal mechanisms include expressions of disapproval by significant others and withholding of positive rewards for disapproved behavior. Most people internalize norms in the course of socialization. This is any group’s most powerful protection against deviance, in that the individual’s own conscience operates as an agent of social control. When informal sanctions fail, formal agents of social control may be called upon. In contemporary society, such formal agents and agencies include psychiatry and other mental health professions; mental hospitals; police and courts of law; prisons; and social welfare agencies. All these formal agents function to limit, correct, and control violation of norms. Conflict theorists would also point out that social control agents and systems tend, in any society, to serve the interests of powerful groups and to enforce the norms most beneficial to those who make the rules and who, therefore, define unacceptable behavior.

Social control, whether formal or informal, has a dual function. First, it punishes the wrongdoer and reaff’irms the boundaries of acceptable behavior. Second, and less recognized, it regulates the manner in which deviants are treated.

Informal mechanisms of social control include the following EXCEPT ().

A. a high level of interest in ensuring conformity

B. expression of disapproval by significant others

C. withholding of positive rewards for the deviants

D. people’s internalization of norms in socialization