拉伸屈服应力是在拉伸应力—应变曲线上（）处的应力.
A、中点
B、断裂
C、屈服点
D、零点
参考答案：C
There are two buildings, _______ stands nearly a hundred feet high.
A．the larger one
B．the larger of them
C．the larger one that
D．the larger of which
一个4口HUB，分别连接4台主机，那么这个网络结构中有几个冲突域（）？
A.2
B.4
C.3
D.1
