在该体系中石油重馏份对钢有缓蚀作用。
In this system, the heavy fraction of petroleum has corrosion resistance for steel.
以大庆直馏柴油为原料，经异丙醇尿素脱蜡制得纯度较高的重质液体石蜡和低凝点脱蜡油。
High purity heavy liquid paraffin and low condensing point dewaxing oil are produced by urea complex using Daqing crude oil distilling cut as raw materials.
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