What are the top ten black factories in Songgang?

BYD, Zhuo Yi, Great Wall Development, Yiguang, Ying Xing Technology, Lance Technology, Bourne Optics, Xinwangda, Yutong and He Jie Electric. According to the list of Songgang black factories, the top ten black factories are BYD, Zhuo Yi, Great Wall Development, Yiguang, Ying Xing Technology, Lance Technology, Bourne Optics, Xinwangda, Yutong and He Jie Electric. Songgang, which belongs to Baoan District, Shenzhen City, Guangdong Province, is located in the northwest of Baoan District and on the east bank of the Pearl River Estuary.