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【单选题】

You have an SQL query that takes one minute to execute. You use the following code segment to execute the SQL query asynchronously.IAsyncResult ar = cmd.BeginExecuteReader（　）;You need to execute a method named Do Work（　） that takes one second to run while the SQL query is executing. DoWork（　） must run as many times as possible while the SQL query is executing. Which code segment should you use? （）

A、while（ar.AsyncWaitHandle==null）{DoWork（）；}dr=cmd.EndExecuteReader（ar）；

B、while（!ar.IsCompleted）{DoWork（）；}dr=cmd.EndExecuteReader（ar）；

C、while（Thread.CurrentThread.ThreadState==ThreadState.Running）{DoWork（）；}dr=cmd.EndExecuteReader（ar）；

D、while（!ar.AsyncWaitHandle.WaitOne（））{DoWork（）；}dr=cmd.EndExecuteReader（ar）；

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更多“You have an SQL query that takes one minute to execute. You use the following code segment to execute the SQL query asynchronously.IAsyncResult ar = cmd.BeginExecuteReader（　）;You need to execute a method named Do Work（　） that takes one second to run while the SQL query is executing. DoWork（　） must run as many times as possible while the SQL query is executing. Which code segment should you use? （）”相关的问题
第1题
[] You have an SQL query that takes one minute to execute. You use the following code segment to execute the SQL query asynchronously. Dim ar As IAsyncResult = cmd.BeginExecuteReader() You need to execute a method named DoWork() that takes one second to run while the SQL query is executing. DoWork() must run as many times as possible while the SQL query is executing. Which code segment should you use?（） You have an SQL query that takes one minute to execute. You use the following code segment to execute the SQL query asynchronously. Dim ar As IAsyncResult = cmd.BeginExecuteReader() You need to execute a method named DoWork() that takes one second to run while the SQL query is executing. DoWork() must run as many times as possible while the SQL query is executing. Which code segment should you use?（）

A、A.
B.
C.
D.  

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第2题
[单选题] What is true about joining tables through an equijoin?（）

A、You can join a maximum of two tables through an equijoin.  B、You can join a maximum of two columns through an equijoin.  C、You specify an equijoin condition in the SELECT or FROM clauses of a SELECT statement.  D、To join two tables through an equijoin, the columns in the join condition must be primary key and foreign key columns.  E、You can join n tables (all having single column primary keys) in a SQL statement by specifying a minimum of n-1 join conditions.  

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第3题
[单选题] What is true about joining tables through an equijoin? （）

A、You can join a maximum of two tables through an equijoin.  B、You can join a maximum of two columns through an equijoin.  C、You specify an equijoin condition in the SELECT or FROM clauses of a SELECT statement.  D、To join two tables through an equijoin, the columns in the join condition must be primary key and foreign key columns.  E、You can join n tables (all having single column primary keys) in a SQL statement by specifying a minimum of n-1 join conditions.  

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第4题
[] What is true about joining tables through an equijoin?（）

A、A.You can join a maximum of two tables through an equijoin.  B、B.You can join a maximum of two columns through an equijoin.  C、C.You specify an equijoin condition in the SELECT or FROM clauses of a SELECT statement.  D、D.To join two tables through an equijoin, the columns in the join condition must be primary key and foreign key columns.  E、E.You can join n tables (all having single column primary keys) in a SQL statement by specifying a minimum of n-1 join conditions.  

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第5题
[] What is true about joining tables through an equijoin?（）

A、A. You can join a maximum of two tables through an equijoin.  B、B. You can join a maximum of two columns through an equijoin.  C、C. You specify an equijoin condition in the SELECT or FROM clauses of a SELECT statement.  D、D. To join two tables through an equijoin, the columns in the join condition must be primary key and foreign key columns.  E、E. You can join n tables (all having single column primary keys) in a SQL statement by specifying a minimum of n-1 join conditions.  

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第6题
[单选题] You are a network administrator for your company. All servers run Windows Server 2003. You manage a file server named Server8. You need to create a performance baseline for Server8 by using Performance Logs and Alerts. You need to store the performance data in an existing Microsoft SQL Server database on another computer. You create a new counter log, and you select SQL Database as the log file format. When you attempt to save your changes, you receive an error message stating that you must select a data source name. You examine the configuration of the SQL Logs, as shown in the following dialog box. You need to configure the counter log to use a SQL database. What should you do? （）

A、Use the relog command-line utility to configure a connection to your SQL database.  B、Use Add or Remove programs to install Connection Point Services. Configure a connection to your SQL database.  C、Use the logman command-line utility with the create switch to configure a connection to your SQL database.  D、Use Data Sources (ODBC) to configure a connection to your SQL database.  

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第7题
[单选题] THE MASTER OR AN OFFICER SHOULD HANDING OVER THE WATCH SHOULD SAY（）.

A、I NOW HAVE THE WATCH.  B、I NOW HAVE THE CONN.  C、YOU NOW HAVE THE WATCH.  D、YOU NOW HAVE THE CONN.  

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第8题
[单选题] You have an SQL query that takes one minute to execute. You use the following code segment to execute the SQL query asynchronously.Dim ar As IAsyncResult = cmd.BeginExecuteReader（　）You need to execute a method named DoWork（　） that takes one second to run while the SQL query is executing. DoWork（　） must run as many times as possible while the SQL query is executing. Which code segment should you use?（）

A、While ar.AsyncWaitHandle Is Nothing DoWork()End Whiledr = cmd.EndExecuteReader(ar)  B、While Not ar.IsCompleted DoWork()End Whiledr = cmd.EndExecuteReader(ar)  C、While T hread.CurrentThread.ThreadState = ThreadState.Running DoWork()End Whiledr = cmd.EndExecuteReader(ar)  D、While Not ar.AsyncWaitHandle.WaitOne() DoWork()End Whiledr = cmd.EndExecuteReader(ar)  

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第9题
[单选题] When you have received GA+ from the CES for the INMARSAT-A telex communication, you should immediately select（）and（）you required.

A、an CES / telex mode  B、an SES telex service  C、the service /the subscriber  D、a satellite /an ocean region  

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