常规的无粘结柔性管采用的是多层构造，主要为金属材料增强的热塑性管道衬里。
Conventional unbonded flexible pipe designs are a multi-layer construction based upon a thermoplastic pipe liner reinforced with metallic materials.
常规的无粘结柔性管采用的是多层构造，主要为金属材料增强的热塑性管道衬里。
Conventional unbonded flexible pipe designs are a multi-layer construction based upon a thermoplastic pipe liner reinforced with metallic materials.
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