1, ranking. Aerospace Changfeng Beijing Aerospace Changfeng Co., Ltd. ranks first, Lan Yun Shenlanyun Industrial Co., Ltd. ranks second, and Aerospace Changfeng Beijing Aerospace Changfeng Co., Ltd. ranks first.
2. Main business. Beijing Aerospace Changfeng Co., Ltd. mainly focuses on public safety, smart medical care, electronic information and smart power supply, while Shenzhen Lan Yun Industrial Co., Ltd. mainly focuses on technology, marketing and brand.