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 perform-ance for large elements with small sort items
D. both insertion sort an selection sort require O( moves
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一般情况下,操作数右移1位的结果是原操作数( )。
A. 整除2
B. 乘以2
C. 整除4
D. 乘以4
层次数据模型的主要特征是用( )形式表示实体类型和实体间联系。
A. 关键字
B. 图标
C. 指针链
D. 表格
Which OSI layer are both SLIP and PPP belonged to ( )
A. the Physical Layer
B. the Network Layer
C. the Data Link Layer
D. the Transport Layer
According to covering scope, which three classes can computer network be divided ( )
A. PSN, LAN, WAN
B. MAN,LAN,WAN
C. PSN, FAST Ethernet, LAN
D. PSN, FAST Ethernet, MAN