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【单选题】
SQL语言的查询语句中,说明投影操作的子句是________。A.
SELECT
B.
FROM
C.
WHERE
D.
GROUP BY
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举一反三
【单选题】The end products of the first stage of photosynthesis that drive the second stage are( )
A.
ADP and NAD
B.
ATP and NADPH
C.
H 2 O and ADP
D.
CO 2
E.
low-energy compounds
【单选题】At the final stage o negotiation, an agreement needs to be signed. A signing ceremony is ____.
A.
a useful common practice
B.
a ritual
C.
both the above
D.
unnecessary
【单选题】In the first stage of the conservation program ______.
A.
eggs were removed from the nests of wild condors
B.
female condors were captured and studied carefully
C.
scientists and zookeepers tried to create genetic diversity
D.
condors were induced to lay more than one egg
【单选题】以下哪个句子是用来表达对于现在事实的惋惜或遗憾?
A.
I wish I had read the play.
B.
If only I had known the story.
C.
If only you were more patient
D.
I hope you will read the play beforehand.
【单选题】The end products of the first stage of photosynthesis that drive the second stage are .
A.
ADP and NAD
B.
ATP and NADPH
C.
H2O and ADP
D.
CO2
【单选题】设消费函数为 ,其中虚拟变量D=(1,城镇家庭;0,农村家庭) ,当统计检验表明下列哪项成立时,表示城镇家庭与农村家庭有一样的消费行为 ( )
A.
，
B.
，
C.
，
D.
，
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