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凯式氮包括氨氮和硝酸盐氮()

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测定水样BOD5的培养温度是25±1℃()

Nancy: May I see your driving license and vehicle registration card, please?Dick: ______.

A. Sorry, I forgot to bring my homework.
B. Sure. Here is my business card.
C. Good. Did I do anything wrong?
D. Yes. But I don't think I am a good student.

水样中汞测定的常用方法有冷原子吸收法和双硫腙分光光度法()

水样中硝酸盐氮测定的常用方法有酚二磺酸分光光度法、镉柱还原法、戴式合金法和紫外分光光度法()

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