It refers to different liquidation instructions, FOK refers to all liquidation or all cancellation, FAK refers to how much liquidation, and all the parts that cannot be closed are cancelled.

Futures are subject to margin trading, T+0 and two-way trading. Trading hours are: 9: 30am-1:30am from Monday to Friday, afternoon13: 00pm-15: 00pm, and other times as stipulated by the futures exchange. No trading on legal holidays.