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问题
单项选择题 A1/A2型题
最先被用作标记免疫技术的标记物是（）
A.荧光素
B.放射性核素
C.酶
D.激素
E.生物素
答案
参考答案：
A
选择题
— Ouch! You hurt me!
— I am sorry. But I _____ any harm. I _____ to drive a rat out.
A. didn't mean; tried
B. don't mean; am trying
C. haven't meant; tried
D. didn't mean; was trying
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名词解释
容积率
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