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] consists of very first calculating option sensitivities often called the Greeks due to the common exercise of representing the sensitivities using Greek letters. 今日持仓/昨日持仓：中国期货通常指定平今仓和平昨仓来收取不同的费用； Jason Fernando is knowledgeable investor and writer ... https://patrickv108ivi2.blogginaway.com/profile