含氮量(G3)与水分(F3)有关。
不合格的情况:当12.1<=F3<=14.0时,G3<15.2
当F3<12.1时,G3<14.5
if(f3>=12.1&&f3<=14&&g3<15.2,"不合格",if(f3<12.1&&g3<14.5,"不合格","合格"))
if(or(and(12.1<F3,F3<14,G3<15.2),AND(F3<12.1,G3<14.5)),"不合格","合格")