反渗透水的回收率应为（）左右 98%。 90%。 70%。 75%。
A manufacturing customer wants a consolidation solution that provides scale-out capability and the highest processor density per rack unit. Which of the following solution meets customer’s requirement？（） x3650 M3 with Microsoft Virtual Server。 BladeCenter JS43 with VMware。 x3850 X5 with VMware。 BladeCenter HS22V with VMware。
如果课堂充满了（），没有（）和提升，就没有进步。
目前在北京京能新能源有限公司使用的风机中恩德及上海电气的风力发电机组的主控制器使用的是mita生产的WP3100控制器，那么这几种风机的机舱内主控制器WP3100需要的供电电压为（）。 220V。 DC24V。 AC24V。 AC24V+DC24V。
Your database is in NOARCHIVELOG mode. You start to do a backup， but your users complain that they dont want you to shut down the database to perform the backup. What options are available to you？（） Put the database in hot backup mode and perform an online backup，including backing up the archived redo logs.。 Just back up the database datafiles without shutting down the database.。 You will have to wait until you can shut down the database to perform the backup.。 Mark each datafile as backup in progress， back them up individually，and then mark them as backup not in progress. No archived redo logs will need to be backed up.。 Only back up the datafiles that the user will not be touching. Once the user has finished what they were doing，you can shut down the database and back up the datafiles the user changed during the course of the remaining backu。
按GB7588-2003《电梯制造与安装安全规范》规定，蓄能型缓冲器（包括线性和非线性）只能用于额定速度（）的电梯。
