乙烘气瓶在使用时，瓶体温度不能超过多少度？

《王贵与李香香》

阅读理解

      Zhou Yan, a Junior 3 students in Taiyuan, wishes he never got a mobile phone. Last week, he went to see a doctor because his arms and fingers were hurting, and he could not see very well. The doctor told

him that he had had "mobile phone disease". A growing number of teenagers are getting "mobile phone

disease" as more are buying mobile phones.

      Zhou got his mobile phone only five months ago.  His mum bought it for him to use when he got into

trouble. But Zhou used it to send messages to his friends.  He sent messages to them all the time, even after going to bed.    

      Zhou started to do badly in the exams because he was spending so much time playing with his mobile

phone. His mum got very angry with him. Zhou Yan didn't care about his mum's feeling at all. But one day, Zhou's arms started to hurt. And that is why he went to see the doctor.Yang Ling, who is from Taiyuan

Teachers College, says that if someone uses his mobile phone too much, like Zhou Yan, he might get "

mobile phone disease". If teenagers find their arms or fingers hurt, she says,they should go to see a doctor as soon as possible.

      Yang Ling suggests teenagers should try to use their mobile phones less, especially at school. They

should try to have fun in other ways, such as reading and doing sports.

1. Zhou Yan wishes he never got a mobile phone because he thinks _______          

A. it is useless to him          

B. it doesn't work well          

C. it has brought him some trouble

2. The reason why Zhou Yan didn't do well in the exams was that _______            

A. he often argued with his mother            

B. he never got help from his teacher            

C. he spent too much time on the mobile phone

3. If we say someone has "mobile phone disease" , we mean __________            

A. they catch a disease caused by mobile phones            

B. something is wrong with their mobile phones            

C. they can't live without the mobile phones

4. Yang Ling suggests that teenagers should __________            

A. go to see a doctor as often as possible            

B. use mobile phones more when they are out of school            

C. do something else for fun instead of using mobile phones too much

5. The writer wants to tell us _______ in his article.            

A. only a few teenagers have mobile phones            

B. mobile phones can help teenagers get out of trouble            

C. using mobile phones too much is bad for both study and health

为什么油压缓冲器被称为耗能型缓冲器？

通常城市500kV、330kV、220kV为( )，110kV、66kV、35kV为( )。

A．二次送电电压；四次送电电压

B．二次送电电压；三次送电电压

C．一次送电电压；二次送电电压

D．一次送电电压；三次送电电压

下列四种元素中，其单质氧化性最强的是[ ]

A．原子含有未成对电子最多的第二周期元素

B．位于周期表中第三周期ⅢA族的元素

C．原子最外层电子排布为2s²2p⁴的元素

D．原子最外层电子排布为3s²3p³的元素