【单选题】Because urban freeways have high speed and high volume traffic, the median should be _________.
C.
not as wide and flat as possible
D.
as wide and flat as possible
【单选题】实践作为检验真理的惟一标准既是确定的又是不确定的,其不确定性是因为( )。
B.
任何实践检验都需要一定的逻辑证明作为补充手段
D.
作为检验真理标准的社会实践总要受到社会历史条件的限制
【单选题】参照完整性规则包括级联更新相关字段和级联删除相关字段,选择了“级联删除相关字段”后,当删除主表中的记录时,( )。
B.
若相关表中有相关记录,则不能删除主表汇中的记录
D.
不做参照完整性检查,删除主表记录与相关表无关
【简答题】A) They tend to drive responsibly. B) They like to go at high speed. C) They keep within speed limits. D) They follow traffic rules closely .
【单选题】Most of the Traffic accidents are()high speed.
【多选题】检验真理的标准,既是确定的,又是不确定的,不确定性是因为
B.
作为检验真理的实践总要受到一定历史条件的限制
【单选题】参照完整性规则包括级联更新相关字段和级联删除相关字段,选择了“级联删除相关字段”后,当删除主表中的记录时,______
B.
若相关表中有相关记录,则不能删除主表中的记录
D.
不做参照完整性检查,删除主表记录与相关表无关
【单选题】Most of the traffic accidents are ______ high speed.
【单选题】A(n) __________ is a divided highway for high-speed traffic with at least partial control of access. The degree of access allowed varies between countries and even between regions within the same coun...
【单选题】Which is China’s first high-speed railway with full independent intellectual property rights opened to traffic?
A.
The Wuhan-Guangzhou high-speed railway
B.
The Zhenzhou-Xi’an high-speed railway
C.
The Beijing-Tianjin intercity railway
D.
The Beijing-Shanghai high-speed railway