黑色系期货夜盘价格持续走低，焦煤、焦炭主力合约跌近2%，铁矿石跌近1%。

Group 1 - The core viewpoint of the article indicates that black commodity futures prices are continuing to decline in the night session, with coking coal and coke main contracts dropping nearly 2% and iron ore falling nearly 1% [1] Group 2 - Coking coal and coke main contracts experienced a decrease of nearly 2% [1] - Iron ore prices saw a decline of nearly 1% [1]