单项选择题
A.总线式结构 B.交叉开关结构 C.多端口存储器结构 D.单线交叉存储结构
A.255.255.255.0 B.255.255.255.128 C.255.255.255.192 D.255.255.255.224
A.80% B.64% C.60% D.50%