lead gauge pitch gauge screw pitch gauge thread pitch gauge
螺距规;
lead gauge pitch gauge screw pitch gauge thread pitch gauge
螺距规;
lead gauge pitch gauge screw pitch gauge thread pitch gauge
螺距规;
lead gauge pitch gauge screw pitch gauge thread pitch gauge
螺距规;
blackness
黑度;
黑色;
黑人性;
铅笔浓度,黑度;