This is determined by the particularity of agricultural products, which are limited by factors such as production season, so the delivery month of imported varieties is every other month, usually a single month. The contract number 1 105 refers to the contract for delivery in May. 1, 3, 4, 5, 7, 9, 1 1 respectively indicate the delivery month. The delivery month means that your contract can only be held until this month at most, and you will face delivery this month.