二十日跌十日:COUNT(C<O,20)>10; 十日跌五日:IF(COUNT(C<O,10)>5,0.8,0); 五日跌三日:IF(COUNT(C<O,5)>3,0.5,0); 三日跌两日:IF(COUNT(C<O,3)>1,0.1,0);
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