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【单选题】
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;
D.
DBCC CHECKDB (DB1) WITH EXTENDED_LOGICAL_CHECKS;
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举一反三
【单选题】按《UCP 600》,受益人应向银行提交的空运单据是( ),即使信用证规定提交全套正本。
A.
Origianl 1 for Accounting
B.
Original 3 for shipper
C.
Original 2 for Consignee
D.
Copy 9 for Agent
【简答题】简述滚动螺旋机构的主要特点及应用。 传动效率高____,起动力矩小,传动灵活平稳; 传动精度高,低速不爬行,同步性好; 可实现逆传动,正逆运动效率相同; 不自锁,许附加自锁装置,抗震性差; 制造工艺复杂,要求高,成本高; 使用寿命长,维护简单; 适用于传动精度和灵敏度要求高的场合; 数控机床的进给运动; 各种精密机械的仪器等。
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