A股早评：三大指数集体低开，CPO、旅游板块走低！光库通信跌超8%，天孚通信跌超5%，云南旅游跌超7%

Market Overview - The A-share market opened lower with all three major indices declining: Shanghai Composite Index down 0.45%, Shenzhen Component Index down 0.63%, and ChiNext Index down 0.79% [1] Sector Performance - The oil and gas exploration and service sector opened higher due to a significant overnight increase in international oil prices, with Tongyuan Petroleum rising over 7% and Zhun Oil Co. gaining over 4% [1] - CPO concept stocks generally opened lower, with Guangku Communication dropping over 8% and Tianfu Communication down over 5% [1] - The tourism sector continued its downward trend from the previous day, with Yunnan Tourism falling over 7% and Qujiang Cultural Tourism down over 4% [1]