问题
单项选择题
化学衍生化
A．适用于弱酸、弱碱药物的萃取
B．常使用疏水性ODS萃取剂
C．常用于GC检测的样品前处理
D．常使用与水混溶的萃取剂
E．常使用与水不相混溶的萃取剂
答案
参考答案：C
搜题请搜索小程序“爱下问搜题”
化学衍生化
A．适用于弱酸、弱碱药物的萃取
B．常使用疏水性ODS萃取剂
C．常用于GC检测的样品前处理
D．常使用与水混溶的萃取剂
E．常使用与水不相混溶的萃取剂
参考答案：C
| Lana went to see a new movie in the morning. But she didn't enjoy it. She's talking to Jenny about what happened. Jenny: You look unhappy. 1 Lana: I watched a movie in the morning. Jenny: 2 Lana: No. The movie was great. It was the audience (观众)..Some people were late for the movie, some took phone calls during the movie, some made noise while eating snacks and some talked loudly. 3 Jenny: That's too bad! People should obey certain rules while watching a movie. Lana: Yes. The first thing is to keep the theater quiet. We should sit down before the movie begins. 4 We should eat snacks quietly. And we should talk as little as possible. Jenny: 5 And we should take away our rubbish when we leave. Lana: I hope everyone should do these things so that we can enjoy the movie better. Jenny: Me too.
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