问题
多项选择题
关于制备单向免疫扩散法的标准曲线的描述，正确是()
A．将已知含量标准抗原稀释成不同浓度，分别置于琼脂板上扩散
B．量取沉淀环的直径，要求准确度达0.1mm
C．以纵轴代表抗原浓度
D．以横轴代表沉淀环直径
E．用半对数纸绘制标准曲线
答案
参考答案：A, B, C, D, E
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关于制备单向免疫扩散法的标准曲线的描述，正确是()
A．将已知含量标准抗原稀释成不同浓度，分别置于琼脂板上扩散
B．量取沉淀环的直径，要求准确度达0.1mm
C．以纵轴代表抗原浓度
D．以横轴代表沉淀环直径
E．用半对数纸绘制标准曲线
参考答案：A, B, C, D, E
| 补全对话。 | |
Wu Yifan: Hello. This is Wu Yifan speaking. I have a cold. I can't go to your birthday party. Chen Jie: I'm sorry to hear that. __________________ Wu Yifan: I have a sore throat. __________________ Chen Jie: Yes. Wu Yifan: __________________ Chen Jie: Sarah is singing. Zhang Peng is playing the piano. John and Amy are playing chess. Wu Yifan: I want to go, too. Chen Jie: Don't be sad. We will give you a surprise. Wu Yifan: Really? __________________ Chen Jie: Just wait and see. |