$原油指数ETF-ProShares DJ-UBS两倍做多(UCO)$$石油指数ETF-美国(USO)$$原油指数ETF-ProSharesDJ-UBS两倍做空(SCO)$$VelocityShares 3x Inverse Crude Oil ETN(DWTI)$$VelocityShares 3x Long Crude Oil ETN(UWTI)$24美元，我纸石油空单收单