What are the main listed companies in China petroleum industry?

What are the stocks in the petroleum industry \x0d\ 600688 S, Sinopec \x0d\ 000554 Taishan Petroleum \x0d\ 0008 19 Yueyang Xingchang \x0d\ 002267 Shaanxi Natural Gas \x0d\ 000698 Shenyang Chemical Industry \x0d\ 600028?