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The flexible pips are made by one kind of steel alloyed and the macromolecule plastic composite pipe (lean pipe). The outer and inner layers of the pipe are coated composite plastics.
线棒——是由一种钢合金与高分子塑料的复合管，其外层与内层均为复合塑料涂层，通过粘合剂与中间层钢合金管道复合成一体的柔性管道。
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