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下列何者不是道氏理論的缺點？(A) 技術指標有鈍化的現象(B) 道氏理論的買賣訊號往往落後於大盤約 20%至 25%(C) 道氏理論只告訴投資人市場趨勢，不能告訴投資人買進何種股票(D) 投資人心理不能接受指數，將反映所有的新聞和統計的基本觀念

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