苗猪网仔猪网北京四方公司浅谈奶牛清粪工艺 鸿丰牧业苗猪网仔猪网 关键词：奶牛场，清粪工艺，机械刮粪板，污粪处理 [gap=668]Key words：dairy farm, manure collection, manure scraper, manure treatment
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Of the collection, one letter best sums up his views on the relationship between manure and freedom.
在他的文集中，有一封信很好地总结了他对于肥料与自由之间关系的看法。
With higher costs for nitrogen (a by product of the petroleum industry) and phosphorus more attention is being paid to the collection, distribution and resultant value of manure.
氮(石油工业副产品)和磷成本较高，因此对有机肥营养物的收集、分配及合成更受关注。
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