大家在查：草甸植被草皮层潘根兴土壤颗粒钩端螺旋体病漂灰土富铝化作用土类有害菌矿化作用

钙层

钙层

钙层

3

They act like pink glue , cementing fragments of shells , sand, and coral with sheets of calcium carbonate .

它们就像粉红色的胶水，把贝壳碎片、沙粒和珊瑚粘和到碳酸钙层。

4

A soil of semiarid and arid regions that is rich In calcium carbonate and lime.

钙层土半干燥和干燥地区含丰富碳酸钙和氧化钙的土壤

5

Surface Softly Compounding of Calcium Phosphate Layer in Alkali Treated Titanium Alloy

碱液处理钛合金表面软复合磷酸钙层

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