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问题 多项选择题

石蜡加氢精制工艺过程中，工艺条件对加氢蜡质量影响最大的是氢分压，所以（）就能大幅度提高产品质量。

A、高空速

B、高压

C、低空速

D、低温

答案

参考答案：B, C

阅读理解

读对话，选择正确的答案。

Chen Jie: Hi, Mike! I have a new schoolbag.

Mike: Wow. How nice!

Chen Jie: Look, it is purple.

Mike: Mm-May I have a look?

Chen Jie: Sure.

Mike: Wow. So heavy! What's in it?

Chen Jie: Many books.

Mike: How many books do you have?

Chen Jie: Thirty story-books, twenty-three notebooks, two Chinese books and one math book.

1. What colour is Chen Jie's schoolbag?

A. Red.

B. Purple.

2. How many notebooks does Chen Jie have?

A. 31.

B. 23.

3. How many books does Chen Jie have?

A. Thirty-three.

B. Thirty.

4. What are books made of?

A. Paper.

B. Great!
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单项选择题

单位时间事故伤亡相对生产的价值的比例称为（）。

A.百万产值伤亡率

B.单位产量伤亡率

C.工日损失严重度

D.人身伤亡事故次数
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