The figure below shows a record used for recording information about a named？ event.Which
A. This is a one-dimensional array of records, also called a table.
B. This is so called record of arrays;
C. The event can occur in up to 20 places and on up to 5 different dates in each place.
D. A reference to r.place[i].date[j].mo will access the month of the jth occurrence, in the ith place, of
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In developing a hospital database, it is determined that on the average, each patient will
A. 6,000
B. 4,800
C. 18,000
D. 1,600
听力原文：What does the man ask for？
(7)
A. Some fruit.
B. Two tapes.
C. A few pieces of paper.
D. A piece of furniture.
In a Chinese family, if children do not behave themselves, they will be usually punished by______.
A. their grandparents
B. their father
C. their mother
D. their uncles and aunts
设有关系R(A,B,C)，在下列的等式中，不成立的是
A. σA＜2(πA，B(R))=π A,B(σA＜2(R)
B. πA,C(σA＜2(R) =σA＜2(πA,C(R))
C. πB,C(σA＜2(R) =σA＜2(πB,C(R))
D. πA(ЛA,B(R))=π A(R)
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