QQQ: 纳斯达克100指数ETF (科技股、网络股、新型消费股)
DIA:道琼斯30指数ETF (传统行业蓝筹股)
SPY:标普500 (大中盘蓝筹股)
IWM:罗素2000 (小盘股)
Beyond Technical AnalysisIWMiwm_spyMultiple Time Frame Analysisnasdaqnasdaq100QQQsp500indexS&P 500 (SPX500)SPDR S&P 500 ETF (SPY) Support and Resistance

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