人字闸门止水橡皮安装顶面平度检测系通过止水顶面拉线测量,每0.5米测1点。
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一般在光通信系统中,功率的单位用dBm表示,插损和增益的单位用()表示。
A. dBm
B. db
C. W
D. mW
网络监控访问Dvs地址有回应,但是看不到录像,如何解决(摄像机没问题)?
A new employee needs access to a SQL Server 2005 database that is located on a server named SQL1. You create a login named ajones by using the following Transact-SQL statement. CREATE LOGIN ajones WITH PASSWORD = ’SQLServer$1’ The new employee reports that when he logs in, he receives the following error message: "Login failed. The user is not associated with a trusted SQL Server connection." You need to resolve the error and allow the new employee to gain access to SQL1. What should you do?()
A. Change the SQL Server security mode from Windows Authentication mode to SQL Server and Windows authentication mode.
B. Change the SQL Server security mode from SQL Server and Windows Authentication mode to Windows authentication mode.
C. Ensure that the login name is created with square brackets ([]).
D. Give the login access to a specific database by using the CREATE USER Transact-SQL statement.
停留车辆距警冲标的长度能够容纳下溜放车辆的线路,均可采用溜放调车法。
A. 正确
B. 错误