iron manganese concretion
常见例句
- The curve model can express well the relation between silt content, sand content, slope deposit depth, iron-manganese concretion depth , all the soil fertility properties and terrain.
其中，對數模型能夠對土層厚度、粘粒含量與地形的關系進行最優擬郃； 返回 iron manganese concretion