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【单选题】
在关系模式R(U,F)中,R中任何非主属性对键完全函数依赖是R∈3NF的A.
充分必要条件
B.
充分条件
C.
必要条件
D.
既不充分也不必要条件
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举一反三
【简答题】看图片，选句子。 1. [ ] A. Clap your hands. B. Wave your arms. 2. [ ] A. Shake your body. B. Snap your fingers. 3. [ ] A. Stamp your foot. B. Cross your legs. 4. [ ] A. Shake your body. B. Cla...
【单选题】阅读理解题为6-10题，请按顺序作答。阅读理解：Directions：Read the following passages carefully. Each passage is followed by some questions or unfinished sentences. For each of them there are four choices marked A, B, C, an...
A.
knock on a wood
B.
fling salt over your shoulder
C.
put your best foot forward
D.
cross your fingers
【简答题】听录音，根据你听到的内容，按先后顺序标上序号。 ( ) Snap your fingers. ( ) Wave your arms. ( ) Stamp your foot. ( ) Cross your legs. ( ) Clap your hands. ( ) Shake your body.
【简答题】看图选择正确的句子。 ( ) 1. A. Snap your fingers. ( ) 2. B. Cross your legs. ( ) 3. C. Clap your hands. ( ) 4. D. Stamp your foot. ( ) 5. E. Shake your body.
【简答题】1 Write the words in correct sentences. ► mind / is / dish / your / that / hot /
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【简答题】简述建设单位的安全生产责任。
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