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风疹发病的主要病因是

A．风温时邪

B．风疹时邪

C．湿热邪毒

D．风热邪毒

E．麻疹时邪

Questions 1-4

What in the advertisement has made the man laugh？（）

A．The products were all made from fresh vegetables and fruits.

B．The homemade products were actually made in the factory.

C．The factory was equipped with the most sophisticated machinery.

D．There were homemade fresh vegetables and fruits in the factory.

水银血压计的质量要求之一是（）

A．液柱不应自流

B．有良好的气密性

C．脉搏数±5%

D．测试范围为40～500mg/dl

E．经跌落无泄漏

有压管道的管径与管流水力半径的比值D/R=（）

A.1

B.2

C.8

D.4

当pNa电极（）、（）或（）都是电极衰老或变坏的反映。