给易感者接种特异性抗原，使体内产生免疫抗体，称_______。

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问题填空题

答案

参考答案：主动免疫

画图题

1.	one two three four five school schools
2.	one two three four five pen pens
3.	one two three four five marker markers
4.	one two three four five pencil pencils
5.	one two three four five girl girls
6.	one two three four five desk desks

单项选择题

《城镇燃气设计规范》中规定液态液化石油气管道和设计压力大于（）的气态液化石油气管道应采用钢号10、20的无缝钢管。（条款8.8.1）

A、0.1MPa

B、0.4MPa

C、0.04MPa

D、0.2MPa