A Spear or a robot has the quality of technology only when it______.

A．is used both as a cultural and a physical object

B．serves different purposes equally well

C．is utilized by man

D．can be of use to both man and animal

关于嗜铬细胞瘤的描述，正确的是（）

A.肿瘤体积一般较小

B.肿瘤多呈圆形或椭圆形

C.边界呈强回声带

D.肿瘤内为中等回声，有时可见液性无回声

E.肾外嗜铬细胞瘤常位于盆腔