E-R模型中的联系可以是()。
A 内部联系
B 外部联系
C 多对多联系
D 上对下联系
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商业性金融机构主要包括()。
A存款性机构
B政策性机构
C投资性机构
D监管机构
By citing "Do unto others as you would have them do unto you", the author intends to show
A. it holds true for everyone and everywhere
B. it prompts one to be kinder to other people
C. this principle is religious rather than secular
D. respecting others invites respect from others
在数据关系模型中,一个关系对应一张二维表,元组对应表中的()。
A 一行
B 一列
C 一格
D 一张表
Nicotine replacement products are still recommended since they ______.
A. guarantee abstinence from smoking
B. cause little or no harm to the users
C. do not require any prescription
D. help smokers quit thoroughly
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