Which is NOT a characteristic of an RISC processor

A．a high clock speed

B．a highly optimized pipeline

C．a few general-purpose registers

D．a limited amount of small instructions

下列哪些因素与辐射损伤有关

A．照射部位和范围

B．辐射线的性质

C．血型

D．照射方式

E．X线剂量