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中轨:MA(CLOSE,20),COLOR0080FF; 上轨:中轨+STD(CLOSE,20),COLORFFFF00; 下轨:中轨-STD(CLOSE,20),COLORFFFF00; 上极:中轨+2*STD(CLOSE,20),COLORBLUE; 下极:中轨-2*STD(CLOSE,20),COLORBLUE;