Don't worry, you can trade anything, as long as you remember which one has the largest transaction volume. This is mainly because it is not easy to wash dishes when you do a good deal, and it is easy to wash you with a small contract.

Continuity refers to the price chart of the main contract of this variety from the past to the present.

The delivery time varies according to each futures exchange, such as Shanghai Stock Exchange, Zhengzhou Stock Exchange and Dalian Stock Exchange. Usually a few trading days ago, but before that, the main fund will be moved to the next contract one or two months in advance, and then the main contract will continue to change months.