某公司今年人员离职数为30，而今年在职人员数为150，那该公司人员变动率为()。

Americans will be regretful for ______.A．the extravagant ways of living in the suburbsB．the fast-growing developments in the suburbsC．the devastation caused by the economic crisisD．what they have done over the past few months 点击查看答案

目前应用最广泛的计算机网络拓扑结构是()。

A.星型拓扑
B.网状拓扑
C.树状拓扑
D.环状拓扑

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