A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
_____she comes or not makes no difference.
已知反应NO(g)+CO(g)(1/2)N2(g)+CO2(g)的△H<0。有利于NO和CO转化的措施是下列中哪一种?()
井下爆破时产生的有害气体主要有NO2、CO、CO2和SO2等。
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