The removal capability of nitrobenzene transportation in silt medium is better than that in sand medium.
淤泥介质对硝基苯的除去能力较高，砂砾介质对硝基苯的除去能力相对较弱。
A cathodic protection method was conducted for underground storage tanks in a sand medium by using external coatings and sacrifice anode.
对沙介质中的储罐采用外涂层加牺牲阳极的阴极保护措施。
Medium hard formation with high compressive strength. Such as limestone, taconite, blaize, quartzite, silica sand, basalt, granite ect.
高抗压强度的硬地层，如硬石灰岩。燧岩。硬砂岩。石英岩。石英砂。玄武岩。花岗岩等极硬岩层。
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