脂肪族伯胺与亚硝酸反应放出（），测量其体积从而计算出伯胺基的量。
A.氧气
B.氨气
C.氮气
D.氢气
参考答案：C
用括号中所给单词的适当形式填空。
1. He was by far _____(funny) boy I'd ever seen.
2. These children seemed _____(tire).
3. No matter where she _____(go), I'll go with her.
4. She warned us that it _____(rain)in the afternoon.
5. I will be _____(thank) if you will come.
反刍动物最常用的NPN的是（）。
A、硝酸盐
B、尿素
C、胆碱
D、铵盐
