CONSTRUCTION: It is composed of an inner rubber protection layer, middle rubber layer, steel wire spiral layer and external rubber cover.
结构：由内胶层、内胶保护层、中胶层、钢丝缠绕层和外胶层组成。
CONSTRUCTION: It is composed of an inner rubber protection layer, middle rubber layer, steel wire spiral layer and external rubber cover.
结构：由内胶层、内胶保护层、中胶层、钢丝缠绕层和外胶层组成。
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