采用合理的熔炼工艺、选择合适的碳当量及孕育方法是提高冶金质量的先决条件。
Adopting rational melting process and proper carbon equivalent as well as inoculation process is the precondition to improve the metallurgical quality of castings.
压缩天然气或压缩天然气是在零售层面出售或者通过质量，能量单位或“一加仑汽油当量”或专家组。
Compressed Natural gas or CNG is sold at the retail level either by mass, energy units or "gasoline gallon equivalents" or gge.
基于污染物当量计算方法，探讨了1996年- 2007年三峡水库建设期间污染物来源、各污染源及污染物当量逐年变化趋势，初步分析了库区水体水环境质量总体变化趋势。
Based on the pollutant equivalent method, the trends of pollution source and pollutant load in 1996 ~ 2007 are studied and the trend of water environment quality in Three Gorges Reservoir is analyzed.
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