原标题：昊华科技：氢氟酸作为氟化工基础原料，市场供应充足，公司氢氟酸按市场价采购与销售
The 19th Group of Twenty (G20) Summit was held in Rio de Janeiro Brazil from Monday to Tuesday. In the face of geopolitical conflicts and economic uncertainties, the G20 Summit is expected to exert positive impacts and inject more stability into an unstable world, said Cui Shoujun, Professor and Director of the Institute of International Development Studies at the School of International Studies, Renmin University of China (RUC), in the W.E. Talk with China News Network.