关于分布式结构化 P2P 网络的描述中，错误的是()
D
解析：集中式P2P网络中存在着中心目录服务器，而在分布式拓扑P2P网络中则不存在。分布式结构化P2P网络采用DHT(分布式散列表)进行结构组织，利用分布式散列函数组成的散列表组织数据。DHT采用确定性拓扑结构，仅支持精确关键词匹配查询，无法支持内容、语义等复杂查询。根据题意，故选择D选项。
Lance:Mary doesn't look well.
Lee:______.
We expect Mr. White will ____Class One when Miss Jane retires.
Faced with rapid inflation and _____ international and home markets, many firms havedeclared bankrupt.
I don ’ t like this hat.Please show me____.
The landlady was very strict. She asked that we ____ television on week nights.
Physics is the present day equivalent of ____ used to be called natural philosophy, from ____ most of present day science arose.
We will do our best to _____ shipment to meet your requirements in time.
Everybody has arrived. It's time we ____.
Adults sometimes envy children who play all the time____they themselves have to work.rain orshine.
Mrs. White has _____ that she is not able to get a job.