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Why do rebar futures have indices and 1802, 180 1 etc?
Represents the expiration date of the contract. Thread 180 1 and thread 1802 are specific futures contracts, while thread index is an index, which can only be used for reference and cannot be traded.

Generally, if you play futures, you should choose a contract in the middle time, because if the contract is too new, the trading volume will be small, and if the queen mother approaches delivery, the risk will be too great.