若不使用前述材料，则金属必须涂覆环氧涂层。
Enclosures not made of stainless steel or aluminized steel must be coated with an epoxy coating.
结果表明：流域北部的环江上游、合水川与汭河的径流量和输沙量以及土地覆被空间格局分布差异显著；
Results show that the visible difference of runoff yield and sediment yield and land cover pattern were found in the up of Huanjian, Heshuichuan and Ruihe.
研究采空区剩余沉降对上覆建（构）筑物造成的危害程度，分层沉降观测是比较直观的方法，但由于基岩内测试环固定困难，在大深度采空区上覆岩层中进行分层沉降观测国内未见报道。
But because of hard to fix test ring in bedrock, so report of domestic deep worked-out area overlying rock subsidence observation by layers have not yet been heard so far.
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