square spring steel 中文意思是什麼
square spring steel
解釋
方彈簧鋼-
Standard specification for steel wire, cold - drawn, for zig - zag, square - formed, and sinuous - type upholstery spring units
之字型方型和正弦型裝墊彈簧元件用冷拉鋼絲標準規范
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