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【单选题】
用硫酸酸化的三氧化铬(CrO 3 )遇酒精后，其颜色由红变为蓝绿色，用这种现象可测得司机是否是酒后驾车，反应如下：2CrO 3 +3C 2 H 5 OH+3H 2 SO 4 =Cr 2 (SO 4 ) 3 +3CH 3 CHO+ 6H 2 O此反应的还原剂是 [ ]A.
H 2 SO 4
B.
CrO 3
C.
Cr 2 (SO 4 ) 3
D.
C 2 H 5 OH
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【单选题】This section is to test your ability to give proper answers to questions. There are 5 recorded questions in it. After each question, there is a pause. The questions will be spoken two times. When you ...
A.
I work in a factory.
B.
I read newspaper.
C.
I have bought something for you.
D.
I am very busy now.
【判断题】i have recorded your complaint and blood pressure reading. 翻译: 我已经记录下了你的投诉和你的血压。
A.
正确
B.
错误
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