探测下限指在95％置信度下探测的放射性物质的（）
A.最小活度
B.平均浓度
C.最小浓度
D.最小含量
参考答案：C
———It was a green dinner. _______
———Thanks. But it really only took an hour.
A．You must be tired.
B．I enjoyed it very much.
C．You must have spent all day cooking.
D．I have never had it before.
以下哪项与补体结合试验无关（）.
A.抗原
B.抗体
C.补体
D.溶血素
E.酶
