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【单选题】
数据库设计中，确定数据库存储结构，即确定关系、索引、聚簇、日志、备份等数据的存储安排和存储结构，这是属于数据库设计的哪个阶段的内容?A.
需求分析阶段
B.
逻辑设计阶段
C.
概念设计阶段
D.
物理设计阶段
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【单选题】It is very kind ____ you to help me with my lessons. It is hard ____ me to learn them well.
A.
of; for
B.
of; of
C.
for; of
D.
for; for
【单选题】It is very kind of you to do the washing-up, but you it.
A.
mustn’t have done
B.
wouldn’t have done
C.
mightn’t have done
D.
didn’t have to do
【单选题】It is very kind _______ you to help me with my housework. It is hard _____me to do all the work.
A.
of, for
B.
for, of
C.
of, to
D.
to, for
【单选题】It is very kind ______ you to help me with my lessons. It is difficult ______ me to learn them well. [ ]
A.
of, of
B.
for, of
C.
of, for
D.
for, for
【简答题】IEEEE802.15.4标准定义的无线个域网具有哪些特点?
【简答题】为什么说教育心理学是介于自然科学与社会科学之间的一门交叉学科？
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