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 process [2] involves very first calculating selection sensitivities often called the Greeks because of the popular practice of representing the sensitivities applying Greek letters. Producing for openDemocracy, Adem Ferizaj reported: "Over the 1 hand, PNL stands out sound-aesthetically from other ... Successfully Submitted (Awaiting Approval)