进口设备的交货类别不包括( )。 A．内陆交货 B．海上交货 C．目的地交货

瓦斯的危害主要有哪些？

晶型沉淀的沉淀条件可概括为

A．稀、热、快、搅、陈

B．稀、热、慢、搅、陈

C．浓、热、慢、搅、陈

D．浓、热、快、搅、陈

E．浓、冷、慢、搅、陈

 —When did he leave the classroom?

—He left _____you turned back to write on the blackboard.

A．the minute

B．the time

C．until

D．before

阅读下面的短文，然后按照要求写一篇150词左右的英语短文。

If you like to break things when you are unhappy, the Nanjing Zhonghua Middle School is the school for you. This term, Nanjing Honghua Midlde School will build a "stress wall" to help students who feel unhappy because of schoolwork or for other reasons.

Tao Dehua, a leader at the school said the idea of a stress wall started when footprints were found on some newly painted walls and some school windows were broken.

"These things happen because some students feel lots of pressure from their studies or because they don't get along well with other students. When under stress, the body get ready to either run or fight and becomes very nervous. Hitting the wall can help relax the body and take away stress," Tao said.

"Tests and homework make me Sad," said Lu Yan, a junior girl."I can't wait to hit the wall. It will help me a lot with my problems."     

Another girl student who wouldn't give her name said that the wall won't help."Mainly because it can't talk," she said. "I need to talk to someone when I'm sad."

【写作内容】

1、以约30个词概括这段短文内容；

2、然后以约120个词就“Should the stress wall be built"这个主题发表你的看法，并

包括以下要点：

(1)学生的压力来源；

(2)是否该建此墙；

(3)提供一些其他有效的减压方法。

【写作要求】

l、可以参照阅读材料但不得直接引用原文的句子；

2、作文中不得出现真实的姓名和学校名称。

【评分标准】

概括准确，语言规范，内容合适，篇章连贯。

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双作用叶片泵叶片采用前倾角的主要目的是（）。

A.改善泵的吸入性能

B.提高泵的效率

C.改善叶片受力情况，以防卡阻

D.增加泵的压头