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【单选题】
The bald eagle (秃鹰) _____ the United States. [     ]
A.
relates
B.
takes the place of
C.
represents
D.
stand for
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【单选题】一个 1:n 联系可以转换为一个独立的关系模式,关系的码为 ( )
A.
实体的码
B.
各实体码的组合
C.
n 端实体的码
D.
每个实体的码
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【单选题】从所给四个选项中,选择最合适的一个填入问号处,使之符合所给的题干所示:
A.
A
B.
B
C.
C
D.
D
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【简答题】选词填空 从方框中选择合适的单词填入下列句子中。 habit, hardly, unhealthy, same, eat, exercise surf, try, never, different, difference, keep, program 1. We should ________ every day. It's good to us. 2. Here are some _______...
【简答题】选词填空从方框中选择合适的单词填入下列句子中。 Turn, cut, peel, mix, drink, roll, eat, pour, have, boil, add, take , put, make 1. How long does it _______  to get to school? 2. I can't come. I _______ a really busy day . 3....
【单选题】20CrMnTi钢中Ti元素的主要作用是( )。
A.
细化晶粒
B.
提高淬透性
C.
强化铁素体
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