此指标适合做中线操作用，根据此指标选股，要求跌下20日均线3天不回头卖出，可获得大波段利润！ma20:=ma(close,20);
BTma20:= (close>ma20) and (ref(close,1)>ref(ma20,1)) and (ref(close,2)>ref(ma20,2));
vol120:=ma(vol,120);
BTvol120:= (vol > vol120) and (ref(vol,1) > ref(vol120,1)) and (ref(vol,2) > ref(vol120,2));
小盘:=(CAPITAL<100000);
中线强势:小盘 and BTma20 and BTvol120;
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