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【单选题】
描述数据库中全体数据的全局逻辑结构和特征的是A.
外模式
B.
用户模式
C.
内模式
D.
概念模式
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举一反三
【单选题】A Dolphin and an Astronomer One day in 1963, a dolphin named Elvar and a famous astronomer, Carl Sagan, were playing a little game. The astronomer was visitin9 an institute which was looking into the ...
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】在广式香肠的生产中( ) 具有良好的呈色和发色作用,能抑制腊制品腐败菌的生长,同时能产生特殊的腌制风味,防止脂肪氧化酸败。
A.
白 糖
B.
酒
C.
盐
D.
酱油
E.
硝酸 盐
【单选题】A Dolphin and an Astronomer One day in 1963, a dolphin named Elvar and a famous astronomer, Carl Sagan, were playing a little game. The astronomer was visiting an institute which was looking into the ...
A.
Right
B.
Wrong
C.
Not mentioned
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