sinistrorse screw
... 作用安全性：work safety 左旋螺丝：left handed screw 左旋(同分)异构体：laevoisomer ...
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... 奇[异]点定理 singularity theorems 左旋螺丝 sinistrorse screw 尾闾;壑 sink ...
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左旋螺纹丝锥 left-hand thread tap
左旋螺纹手控丝锥 left-hand thread manual tap
左旋纹螺丝攻 left hand tap
也称为六角头螺丝或六角头螺栓。包括标准，钻孔头，左旋螺，自封式，军用规格螺栓。
Also known as Hex Head Screws or Hex Head Bolts. Includes Standard, Drilled Head, Left Hand Threaded, Self-Sealing, and Military Specification Cap Screws.
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