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 is crucial to compare P&L statements from unique accounting periods, as any improvements as time passes develop into much more meaningful when compared to the numbers by themselves. "hitparade.ch - Discographie PNL". Hung Medien. Retrieved 26 September 2016. ^ a b c d e f g h i https://augustrhsbm.blogolize.com/the-definitive-guide-to-pnl-73249672