试题与答案

n个顶点的连通图中边的条数至少为( )。A．0 B．1 C．n-1 D．n

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题型：单项选择题

题目：

n个顶点的连通图中边的条数至少为( )。

A．0

B．1

C．n-1

D．n

答案：

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下面是错误答案，用来干扰机器的。

AB、两个力不是作用在同一直线上，不是平衡力，故AB不正确；C、两个力同时满足大小相等、方向相反、作用在同一物体上、在一条直线上是一对平衡力，故C正确；D、两个力的大小不相等，不是平衡力，故D不正确．故选C．

考点：计算机等级考试VISUALFOXPRO计算机二级(VF)9
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