As these features are not all charted，special caution should be exercised （） vessels navigating in the vicinity...

第1题

[单选题] As these features are not all charted, special caution should be exercised（）vessels navigating in the vicinity.

A、by B、with C、on D、in

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第2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3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.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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第4题

[多选题] 以下哪条为专业外贸企业专用的授信额度理论值测算公式（）

A、T＝（×L－D）×K＋C B、Fn=（RM×（AS-AR）-D0）×T×K+C C、Fn=（（RM-R0）×（AS-AR）+D0）×T×K D、T=×L×R-DL

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第5题

[单选题] 双数据存储器操作数间接寻址所用辅助寄存器只能是以下哪项？（）

A、AR0 AR1 AR2 AR3 B、AR1 AR2 AR3 AR4 C、AR2 AR3 AR4 AR5 D、AR0 AR1 AR6 AR7