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 Can be crucial to check P&L statements from different accounting intervals, as any improvements as time passes turn into more meaningful than the numbers on their own. This process calculates the value of the trade based on The existing along with the prior day's charges. The formulation for waiting for link from Press Release (93)