9.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;