肾细胞癌的特点包括（）

A.肾上下极多见

B.多呈明显浸润性生长，边界不清

C.早期即可发生血道转移

D.透明细胞癌最为常见

E.癌细胞可排成 * * 状或管状

Prototyping method is a dynamic design process, it requires people who use prototyping method should have the following capability( ).

A．proficient program expertise

B．immediately acquire requirement

C．coordinate & organize eloquently

D．handle tools smartly