何谓酶定向进化？有何特点？
You are the desktop administrator for your company. Laura is a user in the company's accounting department. Laura uses a Windows XP Professional computer. Laura installs a new software application that was listed on her Add or Remove Programs list. Laura reports that the new application now opens whenever she double-clicks any file that has a .doc file name extension. She also reports that 24 new icons appear on the New menu when she right-clicks her desktop. Laura asks you to reconfigure her computer so that Microsoft Word opens when she double-clicks files that have a .doc file name extension. She also wants you to remove the new icons from the New menu. You instruct Laura to uninstall the new application. After she uninstalls the application, she reports that she can no longer open .doc files by double-clicking them. She also reports that the unwanted icons on the New menu are still present. You reinstall the new application, and it continues to open when Laura double-clicks .doc files. You want to restore the .doc file association and to remove the unwanted icons from the New menu on Laura's computer. You want to accomplish these tasks as quickly as possible. You also want to ensure that none of Laura's other documents or personal settings are affected. What should you do?（） ["Restore the computer to the restore point that was created when Laura installed the new application.","Restore the System State data to Laura's computer from a backup tape. ","Use the Windows XP Professional CD-ROM to perform an Automated System Recovery (ASR) restore. ","Restart the computer by using the last known good configuration.&e"]
硬母线水平排列的允许载流量比竖直排列时安（）。 ["大","小","一样","略大"]
建立在马克思主义的原则基础上的统一包括（）。 ["思想统一","行动统一","政治统一","组织统一"]
The servers on your network run Windows Server 2008 R2. You are planning a two-node Hyper-V failover cluster with SAN storage， and 16 virtual machines （VMs）. You plan to use quick migration. You need to place the maximum number of VMs on each logical unit number （LUN）. You need to ensure that you can move individual VMs between cluster nodes without affecting other VMs. How many VMs should you place on each LUN？（） ["one","two","four","eight"]
药物相互作用
