A poisonous brown gas, NO2, often found in smog and automobile exhaust fumes and synthesized for use as a nitrating agent, a catalyst, and an oxidizing agent.

  • 二氧化氮:一种有毒的红棕色气体,NO2,常在烟雾和汽车排放的气体中发现,被合成用来作硝化剂、催化剂以及氧化剂
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