Which is better, Du Nan environment in Wuhu or Zhongan Heavy Industry?

That depends on your major or your future career plan. Anyway, it is good to have an internal recruitment system in Dunan, because companies in Du Nan are all over the country. If it develops well, it can flow within companies all over the country, which is a good way to develop. Moreover, the road to promotion is smoother than that of outside enterprises, because the internal systems are quite sound.