编写标准：如题:
请教师帮助
可否在一下基本上再加上 以21均线为趋势线，趋势往上才出現标志
XG1:=CROSS(C,MA(CLOSE,5));
DRAWICON(XG1,L*0.98,9);
XG2:=CROSS(C,MA(CLOSE,13));
DRAWICON(XG2,L*0.98,1);
编写方式 ：XG1:=CROSS(C,MA(CLOSE,5)) AND NDAY(MA(C,21),REF(MA(C,21),1),2);
DRAWICON(XG1,L*0.98,9);
XG2:=CROSS(C,MA(CLOSE,13)) AND NDAY(MA(C,21),REF(MA(C,21),1),2);
DRAWICON(XG2,L*0.98,1);
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