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； We are sending the asked for information in your email now. If you do not acquire the email, make sure to Look at your spam folder in advance of requesting the information again. 今日持仓/昨日持仓：中国期货通常指定平今�