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 method [2] will involve very first calculating solution sensitivities known as the Greeks because of the frequent follow of symbolizing the sensitivities using Greek letters. "hitparade.ch - Discographie PNL". Hung Medien. Retrieved 26 September 2016. ^ a b c d e file g h i j k waiting for link from Social Network Posts (72)