All notes in the previous period: when closing positions, you can choose to close positions or close positions; Holding historical positions and new positions at the same time on the same day, investors can either level the new positions (that is, level the current positions) or level the historical positions (that is, level the old positions) first. When both positions are the current position or the old position, follow the principle of first drive. Dashang Institute, Zhengshang Institute, CICC and Shanghai Energy Trading Center all have no trading orders, and hold historical positions and new positions on the same day. When closing positions, only priority historical positions can be defaulted. Whether it is the current warehouse or the old warehouse, it follows the principle of trading first.