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问题 选择题

一定温度下，Wg下列物质在足量氧气中充分燃烧，产物与过量的Na2O2完全反应，Na2O2固体增重Wg，符合此要求的组合是①H2　②CO　③CO和H2　④HCOOCH3 ⑤HOOC-COOH  [ ]

A. 全部

B. 仅④⑤

C. 仅①②③

D. 除⑤外

答案

答案：D

阅读理解

阅读理解。

1. When does the train X504 leave Washington?

A.  9:00.

B.  9:30.

C. 10:00.

D. 10:30.

2. If you have to get to New York before 12:00, you'd better take _________.

A. X500

B. X501

C. X502

D. X503

3. Which of the following trains does not stop at BWI Airport?

A. X502.

B. X503.

C. X504.

D. X505.

4. If you want to go on weekends, you can NOT choose _________.

A. X501

B. X502

C. X503

D. X504

5. Which of the following is true according to the timetable?

A. You can have meals on most of the trains.

B. Most of the trains do not stop at Neward Int'l Airport.

C. You can't buy a ticket at the stations without reservation.

D. Nobody can get from Princeton Junction to Metropark on January 30.

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单项选择题

票据交换录入岗位必须与复核岗位分设，票据提出时，应坚持（）制度。

A.换人复核

B.单人录入
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