在我国三、四级生物安全实验室平面布局中常采用“三区二缓”，下

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问题单项选择题

在我国三、四级生物安全实验室平面布局中常采用“三区二缓”，下列不属于“二缓”的主要功能一项是：（）

A．空气隔离

B．培养基配置

C．去污染消毒淋浴

D．更衣换鞋

答案

参考答案：B

选择题

Lei Feng was a soldier who _____ the people and Chairman Mao used to speak highly of him. [ ]

A. devoted himself to serve

B. devoted himself to serving

C. was devoted to serve

D. devoted himself in serving

填空题

焦油蒸馏时，二次塔用打（）回流。