简述影响土壤水分状况的因素。
经营第二类医疗器械的企业应当办理（）方可经营。 ["《医疗器械经营许可证》","《产品备案凭证》","《医疗器械经营备案凭证》","无需办证"]
You work in a company which is named Wiikigo Corp. The company uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance.You must make sure that all SQL Server instances are consistently configured for naming conventions, security settings, force index creation and avoidance of data fragmentation. So what action should you perform to achieve this goal?（） ["You should use the Database Engine Tuning Advisor. ","In Microsoft SQL Server Management Studio, you should create a maintenance plan ","You should use the SQL Server Configuration Manager ","In Microsoft SQL Server Management Studio, you should create a policy"]
初凝时间的第一次测定为30min，临近初凝时间时每隔（）min测定一次。临近终凝时间时每隔（）min测定一次。 ["15，15","5，10","5，15","15，5"]
Which of the following is not a typical maintenance task within a network maintenance model？（） ["Providing technical customer support","Changing configurations","Updating software","Monitoring network performance","Replacing hardware","Scheduling backu"]
生产安全事故调查处理应当遵循的原则是？
