He is said _____for five years.
A.to have died
B.to die
C.to have been dead
D.dead
答案:C
为了保证CPU执行指令时可正确访问存储单元,需将用户程序中的逻辑地址转换为运行时可由机器直接寻址的物理地址,这一过程称为 【1】 。
什么是方位角?