本文就不同浓度的钡对天然水的生化需氧过程、氨化及亚硝化过程的影响进行了探讨。
This paper discussed the influence on the biochemical oxygen demand, ammoniation and nitrosation by barium of different levels in water.
这样模拟了深低温停循环过程，这个过程中心肺转注机降低病人血温，以使组织器官氧需接近为零。
This mimics the process of deep hypothermic circulatory arrest that is achieved when cardiopulmonary bypass machines cool a patient's blood until the oxygen demand of organs and tissue is nearly zero.
根据曝气过程中氧转移的有关理论，推导出需气量的表达式；
The equation of air demand was derived from the theory of oxygen transfer in aeration.
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