短语词组短語screw thread pitch gage 螺釘螺距槼basic screw -pitch [機]基本螺距Variational Screw -pitch 變導程varying screw -pitch 變螺距screw thread pitch 螺紋screw -pitch precision 螺距精度screw thread pitch gauge 螺釘螺距槼 返回 screw pitch