使用气相色谱做脂肪酸分析时甲酯化的原因是脂肪酸甲酯的沸点低于（），甲酯化后降低汽化温度。
参考答案：脂肪酸
用take 或bring 填空。
1. Can you____my math book here?
2.I can't____ the jacket to your brother.
3. Please____ this chair to your room.
4. Can you____this hat to your father? He needs （需要）it .
5. Please____ that notebook to me.
狭义计量经济学
