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【单选题】
喹诺酮类药物对革兰阴性菌的抗菌作用机制为A.
抑制B-内酰胺酶
B.
抑制细菌DNA回旋酶
C.
抑制二氢叶酸合成酶
D.
抑制细菌细胞壁的合成
E.
增加细菌胞浆膜的通透性
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【单选题】下面关于活性污泥的叙述中错误的是( )。
A.
活性污泥法系统实质上是自然界水体自净的人工模型,是经人工强化的模型
B.
活性污泥是活性污泥处理体系中的主体作用物质,在活性污泥中栖息着具有强大生命力的微生物种群
C.
活性污泥反应进行的结果是废水中的有机污染物和无机物得到降解、去除,废水得以净化,微生物的繁衍增殖使得活性污泥本身也得到增长
D.
活性污泥由四部分物质组成:具有代谢功能活性的微生物群体(Ma);微生物(主要是细菌)内源代谢、自身氧化的残留物(Me);由原污水挟入的难为细菌降解的惰性有机物质(Mi);由污水挟入的无机物质(Mii)
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