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风洞是指macd快速线（白色）快速下穿慢速线（黄色）不久又反身上传慢速线，在图上形成一个空洞。k线走势上多数为空中加油走势。
N 3 20 5
DIF:=EMA(CLOSE,12)-EMA(CLOSE,26);
DEA:=EMA(DIF,9);
CRDAY:=BARSLAST(CROSS(DEA,DIF));
JL:=BARSLAST(ABS((DIF-DEA)/DEA)>0.15);
(CROSS(DIF,DEA) AND CRDAY<N AND CRDAY>1 AND JL>1 AND JL<CRDAY);
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