()是将网络中大量的存储设备集合起来,共同对外提供数据存储和业务访问功能。 ["物联网技术","泛在互联网","云存储技术","云计算技术"]
计划实施时的预期环境是指() ["机会","目标","前提条件","政策"]
煤矿每月观测()次井筒涌水量、水温及水中含砂量。 ["1","2","3"]
具体落实到部门、岗位、人员的计划是() ["战略计划","战术计划","部门计划","业务计划"]
()是用于对系统中流过它的油进行降压,并使阀后压力基本稳定在调定值上。 ["换向阀","节流阀","溢流阀","减压阀"]
SAS如何创造新变量?