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【简答题】
数据库中除了存储用户直接使用的数据外,还存储有另一类“元数据”,它们是有关数据库的定义信息,如数据类型、模式结构、使用权限等,这些数据的集合称为________。(2011)
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反馈参考答案：
举一反三
【简答题】景物制作通常需要四类材料:结构材料、连接材料、塑形材料、( )。
【单选题】如图 耦合电感,当 b 和 c 连接时,其 L a d = 0.2H ,当 b 和 d 连接时, L a c = 0.6H ,则互感 M 为 ( )
A.
0.1H
B.
0.4 H
C.
0.2 H
D.
0.8 H
【单选题】___the survivors in the traffic accident appreciated the police before they left for their homes.
A.
The most of
B.
Most
C.
The majority of
D.
The majority
【单选题】The question of ______ the traffic accident happened hasn't been answered yet, though the police have made on-the-spot investigation.
A.
that
B.
whether
C.
how
D.
whenever
【单选题】The mother who lost her son insisted that the careless driver for the traffic accident ___ yesterday .
A.
was to blame ; happening
B.
be to blame ; happened
C.
be blamed ; was happened
D.
was to blame; had happened
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