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问题 单项选择题

对脑膜炎奈瑟菌抗原主要分型为

A．6种抗原类型

B．5种抗原类型

C．4种抗原类型

D．3种抗原类型

E．2种抗原类型

答案

参考答案：C

选择题
— What does the newspaper say?
 — It's reported that a new airport _____ twenty miles from the city now.

A. is being constructed
B. is constructing
C. has constructed
D. was being constructed
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单项选择题

试带法测定酸碱度，错误的是（）

A.采用酸碱指示剂法

B.pH试剂块含有甲基红

C.pH试剂块含有溴麝香草酚蓝

D.颜色反应由橙红经黄绿到蓝色变化

E.标本放置过久使结果呈现假阴性
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