1998年9月四级笔试试题

A) f is a surjective homomorphism from V1 to V2
B) f is an injective homomorphism from V1 to V2
C) f is an isomorphism from V1 to V2
D) None of the above
(64) P(n) is the predicate 'if 4 divides n then 2 divides n'.
What is the truth value of P(12)?
A) 10 B) F C) T D) None of the above
(65) An algorithm to solve a given problem has time complexity
T(n)=nlog2n-(n-1)
Given that the algorithm takes 0.8 second for a problem in which n=1024，how long should it take for a problem in which n=4096? (2 Points)
A) 39 seconds B) 3.9 seconds C) 3.9 minutes D) 0.8 seconds
(66) What is the definition of a Path?
A) A sequence of vertices and the edges formed by each successive pair of vertices.
B) A walk with distinct vertices.
C) A walk with distinct edges.
D) None of the above
(67) The figure below shows a record used for recording information about a named event.
Which of the following statement is incorrect? (2 Points)
VAR r: record
event:array[1..10] of char;
place:array[1..20] of record
plname:array[1..15] of char;
date: array[1..5] of record
mo:1..12;
day:1..31;
year:integer
end
end
end;
A) This is a>

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