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； The system for every revenue metric on the income and loss assertion (P&L) is said in the subsequent record: This method calculates the worth of a trade depending on the current plus the prior day's selling prices. The formula for selling price effect using the revaluation system is The https://franzs630ejn2.wikienlightenment.com/user