等腰三角形的腰长是6，则底边长a的取值范围是______．
根据三边关系可知：6-6＜x＜6+6，
即0＜x＜12．
故答案为：0＜x＜12．
No sooner _____ the news than they rushed out into the street.
A．they heard
B．they had heard
C．did they hear
D．had they heard
对阴胜之证应选用
A．润下B．曲直C．稼穑D．从革E．炎上
