[名词解释] 腐解作用 decay

土壤局部灭菌 partial sterilization of soil 采用圆曲线形竖曲线，竖曲线半径不小于（）。 ["5000m","10000m","20000m","40000m"] 细菌生理群 physiological group of bacteria 采用圆曲线形竖曲线时，凡相邻坡段的坡度代数差大于（）时须设计竖曲线。 ["1‰","2‰","3‰","4&permil"] 运矿汽车进入转载台调车方式是？ 腐解作用 decay