The 11th Beijing Film Festival kicked off on Tuesday at Beijing Yanqi Lake International Convention and Exhibition Center, surprising guests with comprehensively upgraded services including a cloud-based immersive participation experience, remote transactions, live interaction and online movie viewing.   Nearly 300 Chinese and foreign films will be screened in 31 cinemas in Beijing, Tianjin and Hebei. Among them, the movie “The Battle at Lake Changjin”, which will be released on September 30, was the opening film of this year's film festival. (Photos: Li Hao/GT)