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【简答题】
设关系R和S的元组个数分别为20和30,关系T是R与S的笛卡尔积,则T的元组个数是______。
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举一反三
【单选题】It can be inferred from the passage that the author would be most likely to agree with which of the following statements concerning the solution to food shortages in developing countries?
A.
The introduction of technological innovations to reap profits might alleviate food shortages to some degree, but any permanent solution can come only from effective governmental intervention in the socioeconomic system.
B.
Innovations in agricultural technology will be of little help, and perhaps even harmful, in combating food shortage, no matter how well designed they are to suit local circumstances.
C.
Long lasting solutions will not be found until large landowners adopt improvements that will make production more efficient and thus more profitable.
D.
In order to achieve a meaningful solution to the problem of food shortage, the tastes of the general population must be educated to accept the new food products of modern agricultural technology.
【简答题】有一晶闸管的型号为KK200-9,请说明KK快速晶闸管; 200表示表示____,9表示____。
【简答题】证明如下题图是非平面图．
【单选题】● Sources for data on activity durations and resource requirements can be gathered from which of the following: A Past project records (historical data)
C.
Commercial techniques (standard practices, rules of thumb) C Past project team members knowledge (experience, oldtimers)
D.
All of the above
E.
A and C only
【简答题】有一晶闸管的型号为KK200-9,其中KK表示 ; 200表示 ,9表示 。
【简答题】有一晶闸管的型号为KK200-9,请说明KK ; 200表示表示 ,9表示
【简答题】有一晶闸管的型号为 KK200 - 9 ,请说明 KK ; 200 表示 , 9 表示 。
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