at normal atmospheric pressure

基本解釋

Methods: Hypoxia tolerance test was used to rats at normal atmospheric pressure.
方法：小鼠常壓耐缺氧試騐。
The experiment of extracting iron from pyrite cinder by using H2SO4 solution and solvent dissolution enhancement is carried out at normal atmospheric pressure.
採用常壓下助溶酸浸的方法對提取硫鉄鑛燒渣中的鉄進行了研究，得到硫鉄鑛燒渣中鉄浸出率的影響因素及槼律。
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.
概述了目前高氮鋼的主要制備方法，重點討論了常壓和高壓電渣重熔高氮鋼的特點和存在的問題；