沪深300股指期货【股指期货早盘开盘】（IF）上证50股指期货主力合约下跌0.59%（IH）中证500股指期货主力合约下跌0.60%（IC）中证1000股指期货主力合约下跌0.25%（IM）主合约下跌0.20%