短語詞組短語d helical profile surface 三維螺旋齒廓曲面helical curved surface 螺旋曲面Hyperslender helical -surface 超細長螺旋曲面helical shaped surface plates 螺旋形狀表面極板helical -surface of the screw 螺桿加工mouldboard with helical surface 螺旋型犁壁 返回 helical surface