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运用BOLL编辑一个底部信号（见底）指标
N:=20;
BOLL:=MA(CLOSE,N);
UB:=BOLL+2*STD(CLOSE,N);
LB:=BOLL-2*STD(CLOSE,N);
买:=BETWEEN(REF(C,1),LB,BOLL) AND CROSS(C,BOLL) AND BOLL>REF(BOLL,1);
DRAWICON(买,BOLL,25);
卖:=REF(C,1)>UB AND CROSS(UB,C) AND C/REF(C,1)<0.97;
DRAWICON(卖,UB,26);
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