double-wall corrugated pipe 双壁波纹电缆套管
double wall tube 双层管
double wall box 复壁纸箱
double wall funnel 夹壁漏斗
double-wall corrugated paper 双壁瓦楞纸
double wall cooling roll 复壁冷却辊
double wall corrugated board 双层瓦楞纸板
double wall breakwater 双墙防波堤
double wall tank 双壁罐
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