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【单选题】
给出下列四个命题,正确的个数是() (1){3,2,3,4}是由4个元素组成的集合; (2)集合{0}表示不含有元素的集合; (3)集合{1,2,3}与集合{2,1,3}是相同的集合; (4)集合{x| x<100,x N}中元素的个数是100.A.
1
B.
2
C.
3
D.
4
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举一反三
【单选题】Woman: Do you think Professor Simpson will cancel class on account of the special conference? Man: Not likely. Question: What does the man mean?
A.
He doesn't like the professor very much.
B.
He doubts class will be cancelled.
C.
He doesn't want to attend the conference.
D.
He wonders whether the professor is an actor.
【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】Professor Simpson ___________ the project carefully and made a fewcorrections.
A.
went up
B.
went clown
C.
went after
D.
went over
【单选题】Why do the man and woman want to talk to Mr. Simpson?
A.
He is a psychology professor with much knowledge.
B.
His views during arguments are very powerful.
C.
He may be able to add information to a research paper.
D.
He has personal experience in this field.
【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)
【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】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 。
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