问题 问答题 简答题

简述温度变送器的工作原理和用途?

答案

参考答案:

温度变送器的工作原理:热电偶(或热电阻)的信号输入仪表后,经输入桥路转换成直流毫伏信号,该信号与负反馈信号比较后,经放大器调制放大到足够大,放大后的信号由输出变压器输出到检波放大器滤去交流后输出一个随输入温度信号变化的(0-10)mA的统一信号。

温度变送器可以同各类热电偶、热电阻配合使用,将温度或温差信号转换成统一的毫安信号,温度变送器再与调节器及执行器配合,可组成温度或温差的自动调节系统。

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第二节语法填空(共10小题;每小题l 5分.满分l5分)

阅读下面短文,按照句子结构的语法性和上下文连贯的要求,在空格处填入一个适当的词或使用括号中词语的正确形式填空,并将答案填写在答题卡标号为31—40的相应位置上。

It is difficult for parents of nearly every family to teach their children to be responsible for housework,    31   with one of the following suggestions, you really can get your children to help at home.

If you give your children the    32    (impress) that they can never do anything quite right, then they will regard    33   as unfit or unable persons.    34   children believe they can succeed, they will never become totally independent.

My daughter Carla’s fifth grade teacher got every child in her class   35   (feel) special. When students received less than a perfect test score, she would point out    36   they had mastered and declared firmly they could learn what they had missed.

You can see the same technique when you evaluate your    37   work at home. Don’t always scold and give lots of praise    38   . Talk about what he has done right, not about what he hasn’t done. If your child completes a difficult task, reward him    39    a Sunday trip or a ball game with Dad. Learning is a process of trying and failing and trying and   40   . If you teach your children not to fear a mistake of failure, they will learn faster and achieve success at last.

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