iron manganese concretion

常見例句

雙語例句

• 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(duì)數(shù)模型能夠?qū)ν翆雍穸?、粘粒含量與地形的關(guān)系進(jìn)行最優(yōu)擬郃；
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