流量控制器：对于高温，对腐蚀性介质，在特殊材料和特殊设计。
Flow controllers: for high temperatures, for aggressive media, in special materials and special designs.
脱盐水介质中含有低浓度的酸或碱，它们对橡胶有较大的腐蚀性。
Desalting water medium containing low concentration of acid or base, they have more rubber on the corrosion.
由于介质和材料的特殊性，人们对海泥的腐蚀性和管线钢在其中的腐蚀行为了解得还不太深入和系统。
Because of the particularity of the medium and material, our knowledge of corrosivity of sea mud and behavior of pipeline steel exposed in it is not enough.
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