单项选择题

抗原抗体分子结合的最适比例称为最适比,此时()

A.上清中有少量游离抗体
B.上清中有少量游离抗原
C.上清中几乎无游离抗原或抗体存在
D.出现沉淀物是肉眼不可见的

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单项选择题
当产量一定时,为使生产成本最低,要求: A.等成本曲线与生产可能性曲线相切 B.等产量曲线与等利润曲线相切 C.等产量曲线与等成本曲线相切 D.等产量曲线与等收入曲线相切
A.等成本曲线与生产可能性曲线相切

B.等产量曲线与等利润曲线相切

C.等产量曲线与等成本曲线相切
单项选择题
The three foreigners were pushed out of the way because().

A.they did not queue for the bus
B.they were foreigners
C.the people were unfriendly
D.there were not any reasons

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