【单选题】If a sailing vessel with the wind on the port side sees a sailing vessel to windward and cannot tell weather the other vessel has the wind on the port or starboard side, she shall ______.
C.
keep out of the way of the other vessel
D.
turn to port and come into the wind
【单选题】He did not write ,though he had
A.
careful enough;enough time
B.
carefully enough;enough time
C.
enough careful;enough time
D.
enough carefully;time enough
【多选题】Different liner use themselves sailing schedule, however general sailing schedule includes( ).
【单选题】关于查询与视图,以下说法错误的是________。
A.
查询与视图都可以从一个或多个数据表中提取数据
B.
查询文件以扩展名.QPR保存,其内容实际上是一个SELECT-SQL命令语句
D.
在Visual FoxPro中,生成的视图可以保存为不依赖于数据库的独立的视图文件
【单选题】不可以作为查询与视图的数据源的是____________.
【单选题】ually he saved enough money____________at this trade on the side to buy his .
【简答题】将答案填写上图中(7)、(8)处对应的传输介质;
【简答题】可以作为查询与视图的数据源是______。 A) 视图 B) 数据库表 C) 查询 D) A、B都可以
【单选题】关于查询与视图的说法,错误的是( )
D.
视图是完全独立的,它不依赖于数据库的存在而存在