Anhui Taihe goes straight north along National Highway 15 (without getting off the National Highway) to Shangqiu, Henan, and then turns to National Highway 31 and goes straight west (without getting off the National Highway) to Kaifeng, Henan! ! The whole journey is about 29 kilometers! ! ! All the way is a national highway, which is very convenient and flat. With a GPS mobile phone, you don't have to get off and ask for directions all the way!
What is the specific production method?