The principal environmental problem of landfill is leachate of which the water quality is complex, with high COD_ (cr) and high heavy metal ion concentration as well as high NH_3-N concentration.
生活垃圾填埋场对环境的主要影响是垃圾渗滤液，其水质复杂多变，具有高COD含量、高重金属离子和高nh_3 - N含量的特点。
In static security analysis, the principal methods for static N-1 branch outage simulation include DC power method, compensation method and sensitivity analysis method.
在电力系统静态安全分析中，静态N - 1支路开断模拟的主要分析方法有直流潮流法、补偿法以及灵敏度分析法等。
That is not a view shared by Bert Ammerman, a retired school principal in Northvale, N. J.
对于这个观点，一个来自新泽西州的退休校长，伯特安默曼表示不认同。
It is pointed out that the principal compressive stress direction of tectonic stress field in the area is nearly s - n.
指出，该区构造应力场的主压应力方向为近南北向。
Soil moisture and nitrogen (N) nutrient are the principal factors affecting rice quality.
土壤水分和氮素营养是影响稻米品质的重要因子。
Soil moisture and nitrogen (N) nutrient are the principal factors affecting rice quality.
土壤水分和氮素营养是影响稻米品质的重要因子。
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