Machine testing pictures 6369113930340436317-blid-3182582466145152211

เลขลับเฉพาะ วงใน ชุด 2 ตัวบนล่าง งวดวันที่ 1 สิงหาคม 2562

It is widely used to convey the pressure or corrosive gas and liquid. Now it is widely used in such fields as mechanical engineering, coal mine, petroleum, chemical industry, agriculture irrigation and civil applications (solar water heater or gas cylinder). At the present time, it is widely used as the irrigation pipe to the garden and lawn.