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【简答题】
下图给我们的启示,表达最恰当的一项是( )
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皮皮学刷刷变学霸
举一反三
【简答题】传统的集合“并、差、交”运算施加于两个关系时,这两个关系必须( )。
【单选题】()is the hunter with the professor in the search of gorillas.
A.
Clayton
B.
Sarah
C.
Billy
D.
Tarzan
【简答题】传统的集合“并、差、交”运算施加于两个关系时,这两个关系必须 。
【简答题】Professor Simpson talked to the students about the _________ of scientific laws from observation.(derive)
【单选题】The professor ____ will be here tomorrow.
A.
is talked about
B.
talking about
C.
to be talked about
D.
being talked about
【单选题】Yates tries to lower Simpson down the mountain, but __________.
A.
he suddenly loses his strength
B.
he cannot communicate with Simpson
C.
Simpson hears nothing from Yates
D.
Simpson's injuries stop him from climbing up the rope or communicating with Yates
【简答题】传统的集合运算“并、交、差”运算施加于两个关系时,这两个关系必须 。
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