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 Features that seem With this desk are from partnerships from which Investopedia gets compensation. This compensation may perhaps effect how and in which listings appear. Investopedia would not incorporate all gives obtainable inside the Market. Esto en realidad puede llevar a graves dificultades a la hora de el... waiting for link from Social Network Posts (72)