使用油漆或油性笔，将横梁的轮廓标记在车架轨道上。
Using paint or grease pencil , mark outline of crossmember on frame rails .
圆头油性记号笔，书写流畅，适用任何物品表面书写，快干、耐水、不褪色的开创性色素环保型墨水配方。
Superbline series double-head marking pen , With a good quality and fluent writing . It 's good use for smooth surface , please cover after used .
油性笔