Whenever a pupil makes a mistake, teachers should show him how to correct it ____ punish him.
A. other than
B. rather than
C. sooner than
D. or rather
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实施应用软件程序编写的主要依据是( )
A. 系统说明书
B. 数据说明书
C. 模块说明书
D. 数据流程图
数据库的外模式又称为( )
A. 子模式
B. 模式
C. 概念模式
D. 存储模式
正常工作条件下的薄壁小孔口与圆柱形外管嘴,直径d相等,作用水头日相等,则孔口流量Q和孔口收缩断面流速V1与管嘴流量Q和管嘴口流速V2的关系是:
A. V1<v2,Q1<Q2
B. V1<V2,Q1>Q2
C. V>V2,Q1<Q2
D. V>V2,Q1>Q2
We had to wait for a long time to get our visas, _____
A. didn’t we
B. did we
C. hadn’t we
D. shouldn’t we