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【单选题】
数据模型的三要素是数据结构、数据操作和（）。A.
数据安全
B.
数据兼容
C.
数据约束条件
D.
数据维护
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【单选题】指出下图所示电路构成的锁存器为哪种类型的锁存器? A. 逻辑门控 D 锁存器 B. 门控 RS 锁存 C. RS 锁存器 D. 传输门控 D 锁存器
A.
B.
C.
D.
D
【单选题】Short conversation 1
A.
Run five miles a week
B.
Do whatever she can to exercise
C.
Walk for 10 minutes after dinner
D.
Bike for an hour every day
【简答题】short conversation 1
【单选题】Short conversation 1
A.
Bob remembered all his lines.
B.
Bob performed very naturally.
C.
Bob should have performed better.
D.
Bob should be proud of himself.
【单选题】Short conversation 1
A.
As a hero.
B.
As a thief.
C.
As a role-model.
D.
As a hero who is bad.
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