excess oxygen短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 过剩氧量 The catalyst activity for the selective catalytic reduction of NO by propylene in excess oxygen was investigated. 结果表明：利用沉淀加浸渍制备的样品对 NO选择性还原具有较高的反应活性。 dictall In the power plant, the excess oxygen in flue gas has been measured and used to control the combustion efficiency. 在火电厂中一直是测量燃烧过程出口的烟气含氧量来控制燃烧效率。 cnki