硝酸乙醇纤维素_爱下问搜题

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问题名词解释

硝酸乙醇纤维素

答案

参考答案：

提取试料用HNO₃（20%）和CH₃CH₂OH（80%），加热至沸腾得到。

补全对话，情景问答

从II 栏中找出I 栏中相对应的答语.

                          I
( )1. What's in the basket?
( )2. What are you doing?
( )3. When were you born?
( )4. Where is your Chinese teather?
( )5. Are there any old men nearby?

                 II
A. I was born in 1995.
B. Some eggs.
C. In his office.
D. No,there aren't.
E. I'm washing my clothes.

单项选择题

下列关于英国宪法构成的表达，正确的是( )。

A．由宪法典、宪法性法律、宪法惯例、宪法判例等构成

B．由宪法典、宪法性法律、宪法惯例等构成

C．由宪法典、宪法性法律、宪法判例等构成

D．由宪法性法律、宪法惯例、宪法判例等构成