将一元二次方程x2-12x-9964=0用配方法化成(x-a)2=b的形式为( ),则此方程的根为( )。
(x-6)2=10000;x1=106,x2=-94
He was _____ by his grandparents, so his parents seemed to be strangers to him.
A.brought out
B.brought down
C.brought in
D.brought up
砌体灰缝过厚,会产生砌体滑移对墙体结构不利。 ( )