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【多选题】
下列关于期货套利概念的说法，正确的有（）。
A.
套利是指利用相关市场或相关合约之间的价差变化，在相关市场或相关合约上进行交易方向相反的交易，以期价差发生有利变化而获利的交易行为
B.
如果利用期货市场和现货市场之间的价差进行套利行为，称为期现套利；如果利用期货市场上不同合约之间的价差进行套利行为，称为价差交易或套期图利
C.
跨期套利是指在同一市场（同一交易所）同时买入、卖出同种商品不同交割月份的期货合约，以期在有利时机同时将这些期货合约对冲平仓获利
D.
跨品种套利是指利用两种或三种不同的但相互关联的商品之间的期货合约价格差异进行套利，即同时买入或卖出某一交割月份的相互关联的商品期货合约，以期在有利时机同时将这些合约对冲平仓获利
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