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单向双向：某些产品的手续费只在开仓时收取，有些则在开仓和平仓时都收取；Genius is the last word supply of tunes awareness, created by Students like you who share information and insight with regard to the tunes and artists they enjoy.今日持仓/昨日持仓：中国期货通常指定平今仓和平昨仓来收取