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； It's important to match P&L statements from different accounting intervals, as any changes after some time grow to be extra meaningful when compared to the numbers on their own. On ne change rien à ce qui est en train de se passer, mais on modifie seulement son sens. En https://lutherc973nrt4.wikigiogio.com/user