Nitrogen tetroxide and nitrogen tetroxide that contained certain proportional nitrogen oxide are the important rocket propellants , and the equivalent water content is one of the most important technique index .

四氧化二氮和加入一定比例一氧化氮的四氧化二氮是非常重要的火箭推进剂，相当水含量是其最重要的一项技术指标。

The ultrastructures of amyloplast development and proliferation in maize endosperm cell were observed using the method of glutaraldehyde-osmium tetroxide fixation .

采用戊二醛+锇酸双重固定法观察了玉米胚乳细胞淀粉质体发育和增殖的超微结构。