U.S. stocks tick down as Apple drags tech sector lowerChina's 5G phone shipments top 167 mln in 2020: reportChina's FAST telescope identifies over 300 pulsarsNASA's next Mars mission to probe deep interior of red planetChina continues to push deleveraging despite initial progressU.S. stocks post weekly gains amid tax bill, dataRailway logistics centers completeChina launches new mobile telecommunication satelliteChina renews blue alerts for severe convection weather, sandstormsBIRTV 2017 held in Beijing