作者重点研究了生活污水COD/TN比值变化对其除磷脱氮性能的影响。
The effect of the COD/TN changes of domestic sewage on denitrification and dephosphorization is studied emphatically.
证据就存在于海洋泥土，花粉化石和记录温度变化的化学同位素比值变化之中。
The evidence lies in ocean mud, in fossil pollen, and in changes in ratio of chemical isotopes that record shifts in temperature.
研究了财务杠杆率的图像，讨论了它随税息前盈余与债息之比值变化的规律。
It could shows a rule that the graph changes with the ratio of EBIT to liability interest.
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