气相色谱仪的检测器有()
A.热导检测器
B.质谱检测器
C.电子捕获检测器
D.火焰离子化检测器
E.荧光检测器
参考答案:A, B, C, D
根据首字母或汉语提示写出单词。
1. In b______ class, we learn much about animals and plants.
2. My classmate, Liu Peng won the first prize in yesterday’s ______ (演讲)contest.
3. Mr. Zhang was______ (缺席)from the meeting yesterday. What happened to him?
4. At p______, people in China are busy building an energy saving(节约型)s_____.
5. As We know, Heroin (海洛因) is a kind of bad d ______.
为什么广大学生朋友配镜前最好能进行眼科检查(尤其是学生初次配镜)?