用公式法解方程:3x2-6x-2=0
∵a=3,b=-6,c=-2
∴b2-4ac=60>0(2分)
∴x1=3+153,x2=3-153(4分)
_______ impressed me was the well-known young author, Guo Jingming’s amazing try of directing a movie Tiny Times, which was based on one of his bestseller novels.
A.Which
B.What
C.It
D.That
如图所示,为法洛四联症的病理改变,其中患儿病理生理、病情严重程度及预后主要取决于()
A.右室流出道梗阻程度
B.血流状态
C.右心室肥厚程度
D.病程长短
E.室间隔缺损的大小