调节器输出的改变量与被调参数的偏差值成()的调节规律,称为比例调节规律。 A.正比

题型:单项选择题

问题:

调节器输出的改变量与被调参数的偏差值成()的调节规律,称为比例调节规律。

A.正比

B.反比

C.比例

D.不成比例

考点:合成氨生产工合成氨生产工高级合成氨生产工高级题库
题型:单项选择题

如果b3=1176a,则a可以取到的最小的数是(  )


A.63

B.504

C.27

D.11762

题型:单项选择题

麻醉药品连续使用后易产生瘾癖以及( )。

A.精神依赖性

B.身体依赖性

C.兴奋性

D.抑制性

E.二重性

题型:单项选择题

高压并联电容器组采用双星形接线,双星形电容器组的中性点连接线的长期允许电流应不小于电容器组额定电流百分数为下列哪项数值?()

A.100%

B.67%

C.50%

D.33%

题型:单项选择题

consensus sequence

题型:单项选择题

People know the dangers of fires. It’s good for a family to learn how to prepare for a fire. Here are some suggestions.

Put a smoke alarm in the house. Smoke from a fire causes the alarm to go off. The alarm makes a loud sound. The sound tells everyone to leave the house at once.

Make escape (逃脱) plan. They should know all the ways out of the house. If there is a fire, everyone follows the plan to get out. Part of the plan is to check all the windows to make sure they can be opened easily.

Buy fire extinguishers(灭火器) in the house. Everyone in the family should know how to use them.

Practice for a fire. They do fire practice because they teach children about fire safety. Ever yone in the family should know the following fire rules:

*  Don’t open a hot door! The fire can grow more quickly if you open the door.

*  Stay close to the floor! Smoke can be more dangerous than the fire. The best air is near the floor because smoke rises.

*  What will you do if your hair or clothes start to burn? First, Stop! Don’t run! The fire burns faster because of more air. Drop! Fall to the floor. Then roll! Turning over and over will make the fire go out. Put a blanket(毯子) around you to keep air away from the fire that may still be on you..

There are many possible causes for fires. A wise family is ready all the time. If there is a fire, don’t forget to call 119 for help.

小题1:The writer advises people to do the following to prepare for a fire except that _______.

A.they prepare for a fire

B.they make escape plans

C.they buy fire extinguishers

D.they use electrical cookers小题2:What are the right steps you should take when your hair or clothes catch fire?

A.Stop, run, roll .

B.Stop, drop, roll 

C.Run, drop, roll

D.Roll, drop, stop小题3:What is the best title for this passage?

A.The Dangers of a Fire

B.The Causes of a Fire

C.Learn to Use a Fire Extinguishers

D.Be Ready For a Fire

更多题库