CIIC:Selected anniversaries/November 11

1949: The headquarters of the Air Force of the Chinese People's Liberation Army (PLA) was set up in Beijing, signifying that the Air Force had officially become a branch of the PLA armed services.

1989: The China Aviation Museum opened to the public.

1993: Singles Day, which falls on Nov. 11 – whose date is four ones – started to be celebrated by singles at Nanjing University, Jiangsu Province.

1994: The widest broadband seismograph in the world was developed in China. The JCZ-1 ultra-broadband seismometer, as it was called, is extremely sensitive and able to sense a wide array of scopes, from high-frequency seismic waves to wide frequencies of solid tides.

2009: Alibaba Group, operator of e-commerce platforms Taobao and Tmall, launched Double Eleven Shopping Festival in Tmall.com.