下面有关Access的叙述正确的是______。

A:表是Access数据库中的要素之一，主要用于保存数据信息 B:表中的记录按照某种规则保存，每条记录都由多个字段值组成 C:Access数据库的各表之间一般没有联系 D:Access是著名的关系数据库管理系统，可与其他数据库进行数据交互

下面有关Access中表述正确的是______。

A:表是Access数据库中的最重要的组件之一 B:其他数据库的表内容可以导入到当前数据库中 C:表设计的主要工作是设计表的结构 D:Access数据库的各表之间相互独立

只封禁一台IP地址为203.168.47.59主机的access-list的正确配置是（）

A:access-list 110 permit ip any any B:access-list 110 deny ip host 203.168.47.59 any C:access-list 110 deny ip any host 203.168.47.59 D:access-list 110 deny ip host 203.168.47.59 any E:access-list 110 deny ip any host 203.168.47.59 F:access-list 110 permit ip any any G:access-list 110 deny ip host 203.168.47.59 any H:access-list 110 deny ip any host 203.168.47.59 I:access-list 110 deny ip host 203.168.47.59 any J:access-list 110 permit ip any any K:access-list 110 deny ip any host 203.168.47.59

若要在文本型字段查询以“Access”开头的字符串，正确的条件表达式是______。

A:like"Access*" B:like"Access" C:like"*Access*" D:like"*Access/

只封禁一台地址为193.62.40.230主机的access-list的正确配置是______。

A:access-list 110 permit ip any any B:access-list 110 deny ip host 193.62.40.230 any C:access-list 110 deny ip any host 193.62.40.230 D:access-1ist 110 deny ip host 193.62.40.230 any E:access-list 110 deny ip any host 193.62.40.230 F:access-list 110 permit ip any any G:access-list 110 deny ip host 193.62.40.230 any H:access-list 110 deny ip any host 193.62.40.230 I:access-list 110 deny ip host 193.62.40.230 any J:access-list 110 permit ip any any K:access-list 110 deny ip any host 193.62.40.230

下列关于Access表的叙述中，错误的是( )。

A:在Access表中，可以对备注型字段进行“格式”属性设置 B:若删除表中含有自动编号型字段的一条记录后，Access不会对表中自动编号型字段进行重新编号 C:创建表之间的关系时，应关闭所有打开的表 D:可在Access表的设计视图“说明”列中，对字段进行具体的说明

下列关于Access表的叙述中，错误的是( )。

A:在Access表中，可以对备注型字段进行“格式”属性设置 B:若删除表中含有自动编号型字段的一条记录后，Access不会对表中自动编号型字段重新编号 C:创建表之间的关系时，应关闭所有打开的表 D:可在Access表的设计视图“说明”列中，对字段进行具体的说明

若要在文本型字段执行全文搜索，查找“Access”字符串，则下列条件表达式正确的是( )。

A:Like"Access" B:Like"Access" C:Like"Access*" D:Like"*Access*"

下列关于Access表的叙述中，正确的是( )。

A:在Access表中，不能对备注型字段进行“格式”属性设置 B:创建表之间的关系时，应关闭所有打开的表 C:若删除表中含有自动编号型字段的一条记录，Access不会对表中自动编号型字段重新编号 D:可在Access表的设计视图“格式”列中对字段进行具体的说明

With the explosive popularity of mobile devices, we have witnessed a steady increase in demand for mobile date service. In addition mobile users also expect to connect to the Internet for communicate and access to services through the best suitable connection, anywhere and at anytime. Although the seamless roaming capability is well supported in conventional. Cellular communication networks, roaming and interworking technologies are still immature in heterogenous wireless networks. Seamless roaming over heterogenous wireless networks will be an ongoing and improved process, due to the requirements from both end users and network administrators. From the wireless access networks belonging to different administrative domains, mobile users cannot always identify at every instance which network is the best one to access for their service. It is highly demanded to establish a network architecture which can facilitate mobile terminals to access the appropriate network in a cost-effective way. If a mobile user wants to move from one network to another with continuous service, the terminals have to cope with network change to maintain service seamlessly. Quality of service is a major issue that the end users should be provided with the satisfying service, while the network workload and cost should not too much increased. In addition, since end users are provided with numerous service ranging from Voice-over-IP to Video-on-Demand services, it is expected that users can experience the same quality for all the different service. Therefore, the network architecture need to be designed in such a way that the quality mechanism is incorporated so that users are served according to their individual QoS requirements. Based on the paragraph above 。

Because of (　), mobile users cannot always identify at every instance which network is the best one to access for their services.

A:the different network administrative domains B:the same network administrative domains and mobile users C:mobile users D:the same network administrative domains