Generally, each variety has a main contract, which is a month of active trading. Generally, the main contract will be moved to the next month two to three months before the delivery date, and metals and chemicals will be moved to the next month in 1 month. Now there seems to be some changes, but once agricultural products and oils are moved to the warehouse, the interval is relatively large. For example, sugar 0909 is now moved to 100 1, and palm oil 0909 is also moved to/kloc-0. If the warehouse is moved next time, it is estimated that it will be in the month of 1005. Judge whether the main contract is based on quantity.

Adopt it