问题 问答题 简答题

PM810与PM500有什么区别?

答案

参考答案:PM500需要加装RS485才可以通讯,而PM810不需要加RS485,它本身就带有该附件;PM810本体上带有一个数字量输入,一个脉冲量输出,最多可接13个输入5个输出,而PM500最多只能加一个IO22和一个IO11,即最多只能有3个输入3个输出;PM810本身有报警设定,只要越线就报警,可以在跳闸前设定报警,同时可以记载报警时的信息,PM500的IO22附件如果不用于控制使用,才能用于报警。

阅读理解

阅读理解。

     Nearly everyone is shy in some ways. If shyness is making you uncomfortable, it may be time for a few

lessons in self-confidence. You can build your confidence by following some suggestions from doctors and

psychologists.

     Make a decision not to hold back in conversations. What you have to say is just as important as what other

people say. And don't turn down party invitations just because of your shyness.

     Prepare for yourself for being with others in groups. Make a list of the good qualities you have. Then make

a list of ideas, experiences, and skills you would like to share with other people. I think about what you would

like to say in advance. Then say it.

     If you start feeling self-conscious in a group, take a deep breath and focus your attention on other people,

Remember, you are not alone. Other people are concerned about the impression they are making, too.

     No one ever gets over being shy completely, but most people do learn to live with their shyness. Even

entertainers admit that they often feel shy. They work at fighting their shy feelings so that they can face the

cameras and the public. Just making the effort to control shyness can have many rewards. But perhaps the

best reason to fight shyness is to give other people a chance to know about you.

1. The main purpose of the article is to _____. [ ]

A. explain how shyness developed.

B. recommend ways of dealing with shyness

C. persuade readers that shyness is natural.

D. prove that shyness can be overcome

2. Which of these can you conclude from reading the article? [ ]

A. Shy people never have any fun.

B. Entertainers choose their work to fight shyness.

C. The attempt to overcome shyness is always successful.

D. The attempt to overcome shyness is always rewarding.

3. Who probably gives the suggestion for fighting shyness? [ ]

A. The author of the article

B. Shy men and women

C. Doctors and psychologists

D. Popular entertainers

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