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【多选题】
下列有关期货交易的法律特征,说法正确的有:A.
期货交易的主体是期货交易者、交易场所、期货经营者
B.
期货交易的客体是期货合约或期权合约
C.
期货交易的内容期货是合约交易的内容和期权合约交易的内容
D.
期货交易必须采用公开集中方式
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【单选题】Which description regarding OSPF Network LSAs is correct?（）
A.
They are originated by Area Border Router and are sent into a single area to advertise an Autonomous System Border Router.
B.
They are originat ed by Area Border Routers and are sent into a single area to advertise destinations outside that area.
C.
They are originated by the DR on every multi - access network. They include all attached routers including the DR itself.
D.
They are originated by every router in the OPSF network. They include all routers on the link, interfaces, the cost of the link, and any known neighbor on the link.
【简答题】T h e Chinese spring festival originat es from the wishes of safety and longevity, however Christmas is associated with ______ , mostly ______ .
【简答题】儿童：指年龄满（）周岁但不满（）周岁的人。婴儿：指年龄不满（）周岁的人。
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