【名词&注释】
网络结构(network structure)、通信线路(communication line)、寄存器(register)
[单选题]计算机网络拓扑通过网中节点与通信线路之间的几何关系表示网络中实体间的______。
A. 联机关系
B. 层次关系
C. 结构关系
D. 主次关系
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举一反三：
[单选题]某个数据段位于以70000H起始的存储区，若该段的长度为64KB，则其末地址是
A. 70FFFH
B. 80000H
C. 7FFFFH
D. 8FFFFH
[单选题]Which of the following statements is true regarding simple sort techniques?
A. exchange sort if frequently referred to as a bubble sort.
B. exchange sort is the least expensive.
C. if random data are in an array that is to be sorted ,an insertion sort will give then best performance for large elements with small sort items.
D. both insertion sort an selection sort require O(n) moves.
[单选题]若A和B二数相等，执行A减B后状态寄存器中的标志位为
A. ZF =0
B. ZF = 1
C. OF = 0
D. CF = 1
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