【答案】:B 12、逻辑数据独立性是指( )。 ,用户不变 ,应用程序不变 ,模式不变 ,应用程序不变 【答案】:B 13、设一组初始关键字记录关键字为(20,15,14,18,21,36,40,10),则以 20为基准记录的一趟快速排序结束后的结果是( )。 ,15,14,18,20,36,40,21 ,15,14,18,20,40,36,21 ,15,14,20,18,40,36,21 ,10,14,18,20,36,40,21 【答案】:A 14、BGP runs over a reliable transport ( ). This eliminates the need to implement explicit update fragmentation, retransmission, acknowledgement, and ( ). Any authentication scheme used by the transport protocol may be used in addition to BGP's own (请作答此空)mechanisms. The error notification mechanism used in BGP ( )that the transport protocol supports a “graceful” close, ., that all outstanding data will be delivered ( )the connection is closed.