单项选择题

任意的n阶无向简单图的边数m应满足()。

A.m≤n-1
B.m≤n(n-1)/2
C.m≤n
D.m≥n

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单项选择题
ASCII is a 7-bit code used to represent numeric, alphabetic, and special printable characters. It also includes codes for control characters, which are ().

A.printable or displayable
B.not printable or displayable
C.not printable but displayable
D.printable but not displayable

单项选择题
In most wide area networks, the communication subnet consists of two distinct components:transmission lines and ().

A.networts
B.switching elements
C.computers
D.data terminal equipment

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