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 wants to migrate their existing compute-intensive POWER6 570 to a Power 770. Which of their existing I/O adapters can be migrated to Power 770 enclosures?（） ["PCIe adapters","PCI-X adapters","PCI-X andPCIe adapters","PCI, PCI-X andPCIe adapter"]
世界城市研究的主要内容是什么？
You need to modify the STUDENTS table to add a primary key on the STUDENT_ID column. The table is currently empty. Which statement accomplishes this task?（） [" ALTER TABLE students ADD PRIMARY KEY _ id;"," ALTER TABLE students ADD CONSTRAINT PRIMARY KEY (student_id);"," ALTER TABLE students ADD CONSTRAINT stud_id_pk PRIMARY KEY student_id;"," ALTER TABLE students ADD CONSTRAINT stud_id_pk PRIMARY KEY (student_id);"," ALTER TABLE students MODIFY CONSTRAINT stud_id_pk PRIMARY KEY (student_id)"]
人格发展中（）的普遍现象。
