How many natural gas companies are there in Nanjing?

★ Nanjing Zhongjiang Natural Gas Co., Ltd. \x0d\ Address: 3rd Floor, Comprehensive Building, No.217, Zhujiang Road, Nanjing \x0d\ Nanjing Baijiang Liquefied Gas Co., Ltd. \x0d\ Address: Wanshou Village, Maigao Bridge, Qixia District, Nanjing 10 \★ China Petroleum and Natural Gas Co., Ltd. Jiangsu Nanjing Sales Branch \★ Jiangsu. X0dX0d\ Address: 5th Floor, Block A, Wangjiawan Logistics Center, Xuanwu District, Nanjing \x0d\ Address:No. Daming Road1Kloc-0/5, Nanjing \x0d\★ Nanjing Huagang Gas Co., Ltd. \x0d\ Address: No.2 15, Central Road, Xuanwu District, Nanjing.