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【单选题】
实现关系代数投影运算的SQL子句是（）A.
SELECT
B.
ORDER BY
C.
FROM
D.
WHERE
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【简答题】Each new school year brings fresh reminders of what educators call the summer learning gap．Some call it the summer learning setback．Simply speaking，it means the longer kids are out of 'school，the more...
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【单选题】民法的下列渊源中,在空间上的适用范围受到限制的是( )
A.
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B.
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C.
地方人民代表大会的决议和命令中的民事规范
D.
最高人民法院所作的有关民事问题的司法解释
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