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【单选题】
当一个二维表( A 表)的主关键字被包含到另一个二维表( B 表)中时,它就被称为 B 表的 。
A.
主关键字
B.
候选关键字
C.
外部关键字
D.
超关键字
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举一反三
【单选题】Which of the following is NOT one of the findings of the research?
A.
Some schools chose pupils who got excellent results in music examinations.
B.
The proportion of pupils not getting their first choice in Hillingdon was 29. 5 percent.
C.
Some schools were asking personal information about parents.
D.
The number of secondary schools selecting pupils by aptitude increased.
【单选题】The findings of the two archaeologists threw light on the burial customs of the ancient Egyptians.
A.
paid attention to
B.
gave faith to
C.
laid emphasis on
D.
gave insight into
【单选题】需要长期肠外营养支持的,不宜选择
A.
锁骨下静脉
B.
颈外静脉
C.
颈内静脉
D.
股静脉
E.
外周静脉
【判断题】标准渐开线齿轮的的齿形系数大小与模数有关,与齿数无关。
A.
正确
B.
错误
【判断题】标准渐开线齿轮的齿形系数大小与模数有关,与齿数无关。 ( )
A.
正确
B.
错误
【单选题】看到一份工程设计图,专业人员能看清每个细节,非专业人员只能看图像,这体现了知觉的( )。
A.
选择性
B.
理解性
C.
整体性
D.
统一性
【判断题】标准渐开线齿轮的的齿形系数大小与模数有关,与齿数无关。
A.
正确
B.
错误
【单选题】Which of the following can't be inferred from the findings of the researchers?
A.
Hurricane activity is indeed quite sensitive to climate.
B.
La Nina events prevent more intense and frequent storms from happening.
C.
Current climate conditions resemble those that led to peak Atlantic hurricane activity about 1000 years ago.
D.
The increase in storm intensity and climate change are linked.
【单选题】The findings of the study on the satisfaction ratings in romantic relationship reveal that ______.
A.
meditation can keep the relationship at its peak
B.
retrospection helps people feel satisfied with the partner
C.
specific analysis can foretell the future of the relationship
D.
thinking about delails makes one uncertain about the relationship
【简答题】What is one of the findings of the research? The effects of music do not ______.
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