某排气系统中SO2的浓度为50g/m3,用水吸收SO2,吸收塔在t = 20℃、PZ = 1atm的工况下工作,问气相中SO2的比摩尔浓度为( )kmolSO2/kmol空气.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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