表现房地产的自然特性是（）。 不可移动性。 独一无二性。 供求区域性。 效用持久性。
Which command will change the user webserver’s shell to ksh93？（） chshell -ksh93 webserver。 chsh webserver /usr/bin/ksh93。 chuser -a shell=/usr/bin/ksh93 webserver。 setuid -a SHELL=/usr/bin/ksh93 -u webserver。
A customer has purchased a new IBM Storwize V7000 storage array and is considering an IPbased DR replication solution that is cost-optimized and provides a near instant recovery option fortheir Microsoft Exchange application and server. The backup site is 30 kilometers away. Whatwould be the best choice for replication？（） Storwize V7000 Metro Mirror。 Tivoli Storage ManagerFastBack。 Storwize V7000 Reverse FlashCopy。 Tivoli Storage Productivity Center for Replicatio。
A customer has two separate storage islands and is planning to implement an SVC to provide forFlashCopy between the two islands. What is the minimum number of inter-switch links （ISLs） thatare required？（） 0。 1。 2。 4。
世界城市研究的主要内容是什么？
下列不能用来衡量计算机及网络安全的指标是（）
