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【判断题】
概念数据库是存储数据库的抽象,外部数据库是概念数据库的部分抽取。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】A cartoon series on Confucius was aired on TV, _____ the thinker was a 10-year-old boy, not an old man.
A.
from which
B.
in which
C.
from it
D.
in it
【简答题】凸轮机构的压力角越小，有效分力（），机构的传动性能（）。
【简答题】阅读理解。 Each time I see a balloon, my mind flies back to a memory of when I was a six-year-old girl. It was a rainy Sunday and my father had recently died. I asked my mom if Dad had gone to heaven. 'Yes...
【单选题】—How old is Steve? —He is ____________ and he has an ___________ sister.
A.
13-year-old; 10 years old
B.
13 years old; 11-year-old
C.
13 years old; 10-years-old
D.
13-years-old; 11-years-old
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