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 Provides that show up In this particular table are from partnerships from which Investopedia gets compensation. This compensation may perhaps impression how and where listings show up. Investopedia isn't going to incorporate all offers readily available inside the marketplace. Al citar, reconoces el trabajo uni... waiting for link from Press Release (93)