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问题 多项选择题

可作为梅毒确诊实验的有（）

A.梅毒螺旋体血球凝集试验

B.荧光密螺旋体抗体吸收试验

C.组织切片镀银染色

D.暗视野显微镜

E.直接免疫荧光抗体实验

答案

参考答案：A, B

填空题

一个角的补角比它的余角的补角小30°，则这个角是( )．
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单项选择题

Consumer surplus is most accurately defined as the difference between the:（）

A. total value consumers place on the quantity of a good purchased, and the total amount they must pay for that quantity.

B. value consumers are willing to pay for an additional unit of good or service and the cost of producing the additional unit of the good or service.

C. marginal benefit and the marginal cost of the last unit consumed of a good or service.
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