英语语法分析

The methods of preparing and measuring of trimanganese tetroxide are introduced in the paper.

介绍了四氧化三锰的制备、检测方法及其相关理论研究。

This study is significant for enhancing the quality control of the nitrogen tetroxide on launch site.

该课题的研究对于提高发射场四氧化二氮质量控制水平具有十分重要的意义。

The oxygen utilization rate is low in manganese tetroxide preparation by metallic manganese powder suspending liquid process.

在金属锰粉悬浮液法制备四氧化三锰过程中存在氧气利用率较低的情况。