问题
单项选择题
铁路粘油槽车卸油加热约20min左右，关闭（），使加热蒸汽全部进入加热管路，以保证罐内介质加热效果。
A.排油阀
B.冷凝水阀
C.内螺纹球阀
D.外螺纹球阀
答案
参考答案：C
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铁路粘油槽车卸油加热约20min左右，关闭（），使加热蒸汽全部进入加热管路，以保证罐内介质加热效果。
A.排油阀
B.冷凝水阀
C.内螺纹球阀
D.外螺纹球阀
参考答案：C
| 阅读理解。 | ||||||||||
| Not only adults but also teenagers have problems in their life. Here is a survey showing the main problems of teenagers. They feel stressed because they have too much homework to do both at school and at home. They have lots of exams to take. And parents usually send them to different classes at weekends. They don't have their own time to do what they are interested in. Now more and more teenagers are getting short-sighted (近视). They often read in bed or keep reading for a long time without having a rest. Some of them are crazy about playing computer games. Some spend too much time watching TV Another serious problem among teenagers is that many of them are becoming fat. They eat too much junk food, but they take little exercise. I think teenagers should think of ways to deal with the problems. They should make a plan for study and hobbies and find time to relax as much as possible. | ||||||||||
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