设直线2x+3y+1=0和圆x2+y2-2x-3=0相交于点A、B,则弦AB的垂直平分线方程是( )。
Great inventors don’t ____ graduate from famous universities. Some didn’t even go to university.
A.really
B.nearly
C.necessarily
D.likely
卵巢肿瘤最常见的并发症是()。
A.感染
B.出血
C.破裂
D.恶变
E.蒂扭转