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China's first primary frequency photovoltaic control system connects to grid

China recently put its first primary frequency photovoltaic (PV) control system for new energy into operation in Daqing, northeast China's Heilongjiang Province.The sys

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Biden's physician releases latest update on his COVID-19 symptoms, treatment

U.S. President Joe Biden's COVID-19 symptoms continue to improve and now include "less troublesome" sore throat, runny nose, loose cough and body aches, his physician,