A.nl<15 or xb=="男" B.nl<15 or xb!="女" C.nl<15 and xb=="男" D.nl>=15 and xb=="男"
A.2>3 B.123"=="321" C.22*11>11*22 D.2>3 or 3>2
A.x=y B.x==y C.x+y D.x-y