Answer analysis:

Characteristics of futures contracts: ① standardized contracts. The standard terms of futures contracts are predetermined in terms of commodity variety, quality, quantity, delivery time and place. (2) The performance is mostly through hedging. Only a few futures contracts are delivered in kind, and most contracts are closed before the delivery date. The performance of the contract is guaranteed by the futures exchange or the clearing company. (4) The contract price has a minimum change unit and a floating limit.