[填空题] 《医疗器械经营许可证》的有效期限为（）年。

氧化铝的生产方法有哪些？ 你正在开发一个访问文件系统的程序集。需要写一个代码段当如果现有文件权限禁止使用加载程序集时来配置CLR（） ["[FileIOPermission(SecurityAction.RequestOptional,AllLocalFiles = FileIOPermissionAccess.Read)]","[FileIOPermission(SecurityAction.RequestMinimum, AllFiles = FileIOPermissionAccess.Read)]","[FileIOPermission(SecurityAction.RequestRefuse, AllFiles = FileIOPermissionAccess.Read)]","[FileIOPermission(SecurityAction.RequestOptional, AllFiles = FileIOPermissionAccess.Read)]"] You work in a company which uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance. There is a database named DB1 in the instance. In the Services schema， There is a table named Service.Table. The Services.Table has to be moved from the Sales schema to a new schema named Costs. In the options below， which Transact-SQL statement should you execute？（） ["ALTER TABLE Service.Table SWITCH TO Costs.Table1; ","ALTER SCHEMA CostsTRANSFER Service.Table; ","ALTER USER Service WITH DEFAULT_SCHEMA = Costs; ","ALTER AUTHORIZATION ON Service.Table1 TO Cost"] 科技论文中插图设计的一般原则有（）。 ["一篇论文不是插图越多越好，要恰到好处","插图形式选择要合理","插图种类要选择合适"] BPO 《医疗器械经营许可证》的有效期限为（）年。