若磁盘的转速提高一倍，则( )。
A．平均存取时间减半
B．平均找道时间减半
C．存储密度提高一倍
D．平均定位时间不变
参考答案：D
_________she first heard of the man referred to as a specialist.
A．That was from Stephen
B．It was Stephen whom
C．It was from Stephen that
D．It was Stephen that
一条RPBUS最多可以复接（）个RP。
A.8
B.16
C.32
D.64
