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By field sampling, some original soil microbiotic crusts were gathered and their physico-chemical properties were analyzed. The results revealed that the longer the sand dunes have been fixed, the thicker and the more biocrusts are formed. The thickness of the crusts under four different types of plant community ranges within 0.3 ~ 1.5cm.
物理结皮通常是土壤粘粒在雨水、径流等外力的物理作用下，使土壤表层孔隙堵塞而成型的一层土表硬壳；生物结皮是有不同种类的低等生物组分与其下很薄的土壤共同形成的一个复合的生物土壤层[2]。
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The stability of the goafs of Liangshi gypsum deposit is mainly influenced by the small thickness,water-absorption and low strengths of compression and shear of the upper walls of the orebodies;and by the clearages and bedding ;as well as the undergraound water activity and irregular mining.
两市镇缓倾斜石膏矿床采空区稳定性的影响因素，主要有矿体顶板硬壳——青膏层的厚度薄，易吸水软化，抗压抗剪强度低；区内局部节理发育、层理密集；地下水活动以及开采不规范等。
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Hard shell, smoke-colored plastic cover for MacBook Air：硬壳,烟色塑料盖,为的MacBook空气
Features: 特点: | Hard shell, smoke-colored plastic cover for MacBook Air硬壳,烟色塑料盖,为的MacBook空气 | Thin and sleek薄且光滑