at normal atmospheric pressure

基本解释

Methods: Hypoxia tolerance test was used to rats at normal atmospheric pressure.
方法：小鼠常压耐缺氧试验。
The experiment of extracting iron from pyrite cinder by using H2SO4 solution and solvent dissolution enhancement is carried out at normal atmospheric pressure.
采用常压下助溶酸浸的方法对提取硫铁矿烧渣中的铁进行了研究，得到硫铁矿烧渣中铁浸出率的影响因素及规律。
The features and problems of manufacturing high nitrogen steels by the electroslag remelting method at normal atmospheric pressure and high pressure have been discussed in detail.
概述了目前高氮钢的主要制备方法，重点讨论了常压和高压电渣重熔高氮钢的特点和存在的问题；