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【单选题】
当价格低于均衡价格，股指期货投机者低价买进股指期货合约;当价格高于均衡价格，股指期货投机者高价卖出股指期货合约，从而最终使价格趋向均衡。这种做法可以起到()作用。A.
承担价格风险
B.
增加价格波动
C.
促进市场流动
D.
减缓价格波动
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举一反三
【多选题】How do American parents rear their children?
A.
They are not strict with their children on things like discipline
B.
They ask their children to do some housework
C.
They think building self-esteem is important for children
D.
They want to keep their children happy
【单选题】原子吸收光谱火焰原子化法,试样进入火焰后的过程包括的过程有:()。
A.
蒸发、解离、电离、化合、脱溶剂
B.
电离、蒸发、解离、化合、脱溶剂
C.
化合、脱溶剂、蒸发、解离、电离
D.
脱溶剂、蒸发、解离、电离、化合
【多选题】How do American parents rear their children?
A.
They are not strict with their children on things like discipline
B.
They ask their children to do some housework
C.
They think building self-esteem is important for children
D.
They want to keep their children happy
【简答题】How long do children usually stay at university in the man’s country?
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