∵(a-2)2+b-2a=0,
∴a-2=0,b-2a=0,
解得a=2,b=4.
∴b-a的平方根为±b-a±2.
The young girl became so emotionally ____ with that guy ; he was anything but brilliant .
A.involved
B.interested
C.addicted
D.attracted
埋管式辐射采暖供水温度一般( )。
A.低于50℃ B.低于60℃ C.高于50℃ D.高于60℃