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【单选题】
在数据库系统中，数据库用户能够看见和使用的局部数据的逻辑结构和特征的描述是（ ）。A.
外模式
B.
逻辑模式
C.
概念模式
D.
物理模式
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反馈参考答案：
举一反三
【单选题】He is looking for another job because he feels that nothing he does _______ his boss.
A.
satisfies
B.
serves
C.
promises
D.
supports
【单选题】He found nothing in the room, ______? [ ]
A.
doesn't he
B.
does he
C.
didn't he
D.
did he
【单选题】Nick is looking for another job because he feels that nothing he does ________ his boss.
A.
satisfies
B.
admires
C.
obeys
D.
supports
【单选题】He is looking for another job because he feels that nothing he does ______ his boss. [ ]
A.
serves
B.
promises
C.
satisfies
D.
supports
【简答题】为什么蒸气中含有不凝结气体会影响凝结换热的强度？
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