xy≤(x+y)24=94(当且仅当x=y时,等号成立)
故选B
In_______ most countries, a university degree can give you ____flying start in life.[ ]
A. the; a
B .the; /
C. /;/
D. /; a
SLE累及心血管时,最常见的临床表现是()
A.心肌炎
B.血管炎
C.心包炎
D.心律失常
E.心内膜炎