如果关于x的x2+(p+2)x+p2-4=0的一根为0,另一根不为0,则p的值为( )
A.2
B.-2
C.±2
D.4
根据题意,得
p2-4=0p+2≠0,
解得p=2.
故选A.
The school _____ I visited the other day was not the one _____ I once studied. [ ]
A. that; which
B. which; where
C. where; which
D. where; where
在WORD97中,下列对段落行距的设置,()是对于默认行距而言的。
A、单倍行距;
B、1.5倍行距;
C、2倍行距;
D、多倍行距。