A problem is coating the earth with cement or bitumen on a large scale that would change the horde structural of the microbe in soil particularly in the surface layer of soil.
提出用水泥以及沥青大规模地覆盖土壤对于土壤，特别是土壤表层的微生物种群结构将会造成改变的问题。
The capacitance of FBE coating is the largest, three layer PE , Coal tar, Oil bitumen were similar, but the capacitance of three layer PE is the smallest both in soil and NaCl solution.
四种防护层噪声电阻大小顺序为三层PE>熔结环氧粉末>煤焦油沥青>沥青玻璃布；
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