处理:通过各种方法使污染物从废水中分离出来,一般不改变污染物的化学本性
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自来水在运输过程中需要在水中添加臭氧,以防止自来水运输过程中二次污染
A. 对
B. 错
Fill in the following blanks with the information you learn from the reading text.The philosophy in the pre-Qin times was marked by the emergence of various ancient philosophical views. The most influential schools were , , Mohism and .
自然界中的生物固氮主要分为以下几种类型
A. 自生固氮
B. 共生固氮
C. 联合固氮