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【单选题】
下面有关模式分解的叙述中，错误的是（ ）。A.
若一个模式分解具有无损连接性，则该分解不一定保持函数依赖
B.
若一个模式分解保持函数依赖，则该分解一定具有无损连接性
C.
若只要求分解保持函数依赖，那么模式分解一定可以达到3NF
D.
若只要求分解具有无损连接性，那么模式分解一定可以达到BCNF
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【单选题】— Excuse me. Where do koalas come from? — Oh, they come from ________. [ ]
A.
China
B.
America
C.
Japan
D.
Australia
【简答题】根据汉语提示完成句子: ____(哪里)do they come from? ____(be)they from Greece? No, they're not come from Greece. They come from Italy.
【单选题】一Where do ______ come from? —They come from Australia. [ ]
A.
pandas
B.
penguins
C.
dolphins.
D.
Koalas.
【单选题】—Where do _____ come from? —They come from Australia. [ ]
A.
pandas
B.
koalas
C.
tigers
D.
bears
【单选题】—Excuse me. Where do koalas come from? —Oh, they come from _________. [ ]
A.
China
B.
America
C.
Africa
D.
Australia
【简答题】Where do a lot of the world resources come from? They come from these ______ countries.
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