... helical reinforcement 螺纹钢筋,螺旋钢筋... helical scan 螺旋扫描 helical wheel 螺旋轮,蜗轮...
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helical reinforcement effect 螺旋增强效应
Reinforcement helical 螺旋筋
helical l reinforcement 螺纹钢筋
helical and twisted reinforcement material 螺旋扭状增强材料
helical coil steam generator reinforcement 螺旋箍筋
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