【多选题】【消耗次数：1】
股指期货交易的特点包括？
①
合约有到期日，不能无限期持有
②
采用保证金交易
③
可以双向交易
④
实行现金交割制度
参考答案：
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【简答题】
在期货交易开始之前，期货的买卖双方都必须在[填空1]开立专门的保证金账户，并存入一定数量的保证金，该保证金也称为[填空2]。
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