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 sensitivities technique [two] includes first calculating possibility sensitivities generally known as the Greeks because of the popular follow of symbolizing the sensitivities applying Greek letters. Puis concentrez votre awareness sur certains détails : les expressions du visage, le placement des mains, le ton... https://pnl21853.mappywiki.com/1456665/top_pnl_secrets