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【单选题】
在SELECT语句中,与关系代数中 Π 运算符对应的是________子句。A.
SELECT
B.
FROM
C.
WHERE
D.
GROUP BY
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】请任找两辆量产车,从正侧视图分析、比较其车身的前后比例。请从车身的前、中、后的尺寸之比,分析车身前后比例给人的时间感受。
【单选题】It appears to her _______ he wants to teach us all he has.
A.
that
B.
which
C.
why
D.
what
【单选题】尖晶石MgAl 2 O 4 结构中,正负离子配位数Ma:Al:O=4:6:4,其中与每个O 2- 配位的正离子为 ( )
A.
3个Mg 2+ ,1个Al 3+
B.
1个Mg 2+ ,3个Al 3+
C.
2个Mg 2+ ,2个Al 3+
D.
4个Mg 2+
E.
4个Al 3+
【单选题】Our monitor, ______ it clear to us that he didn’t want to waste time playing computer games, left the Internet bar quickly.
A.
made
B.
having made
C.
make
D.
Had made
【简答题】It
_____ to her that he wants to teach us all he has.A. is B. appear C. appears D. was
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