使用PON上行e8-C终端的家庭布线住宅单元内各类线缆采用()布放并集中到线缆汇聚点(PON上行e8-C设备的安装点)。
A. 星型结构
B. 树形结构
C. 总线连接
D. 无线连接
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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. TheDB1 database includes spatial data types. On DB1 databse, you have to perform a database consistency check to include the spatial indexes. Besides this, you must make sure that you can reduce the effect on the database concurrency to the least. So which Transact-SQL statement should you run? ()
A. DBCC CHECKCATALOG (DB1);
B. DBCC CHECKALLOC (DB1) WITH TABLOCK;
C. DBCC CHECKDB (DB1) WITH TABLOCK, PHYSICAL_ONLY;
DBCC CHECKDB (DB1) WITH EXTENDED_LOGICAL_CHECKS;&e
药材大青叶原植物的科名是()
A. 蔷薇科
B. 十字花科
C. 蓼科
D. 豆科
E. 唇形科
4G闲时流量包的“闲时”时段为()
A. 每日22:00至次日08:00
B. 每日23:00至次日07:00
C. 每日22:00至次日07:00
D. 每日23:00至次日08:00