nutrient source短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 营养源 The nutrient source of dry-farming has comed from air nutrient down into soils, and soil nutrient mineralization, and applied fertilizers. 旱作土壤可为作物利用的养分主要来源于土壤矿化、大气沉降和肥料投入。 cnki The study on immobilized SRB sludge of inner cohesive nutrient source has never been reported. 本研究提出的内聚营养源与SRB污泥共固技术未见报道。 cnki