$道琼斯指数(DJI30)$把空仓加至20%$VelocityShares Daily 2x VIX ST ETN(TVIX)$$纳斯达克指数ETF-ProShares三倍做空(SQQQ)$$纳斯达克综合指数(NASDAQ)$$道指ETF-ProShares三倍做空(SDOW)$$道指ETF-ProShares做空(DOG)$$标普500指数ETF-ProShares三倍做空(SPXU)$$标普500指数ETF-ProShares做空(SH)$