单项选择题

设N为自然数集合,Z为整数集合,Q为有理数集合,R为实数集合,为全体奇数集合,[0,1)和(0,1)为两个区间,下列关系中为假的是( )。

A.(0,1)≈Q
B.Z≤R
C.Q≈N
D.[0,1]≈R
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单项选择题
具有7个结点的所有非同构的树有( )个。
A.7
B.11
C.12
D.14
单项选择题
Which of the following statements is (are) true ( ) Ⅰ. The number of cyclic subgroups of the additive group of integers is infinite Ⅱ. The number of cyclic subgroups of the additive group of real numbers is infinite
A.Ⅰ and Ⅱ
B.Ⅰ only
C.Ⅱ only
D.neither Questions 43、44 refer to the space requirements of different methods of storing graph The Choices for these questions are combinations of the following statement Ⅰ. The space required depends on the number of vertices Ⅱ. The space required depends on the number of edges
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