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【单选题】

You are operating a lift boat.When beginning to jack down you should（）.

A、Jack down one leg at a time

B、Jack up first，then down

C、Undog doors to the engine room

D、Assemble all personnel on the main deck

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更多“You are operating a lift boat.When beginning to jack down you should（）.”相关的问题
第1题
[] You are developing a Windows Communication Foundation (WCF) service that does not operate on a duplex channel.You find that operations do not start until all previous operations have finished. The service hosting code contains the following lines.var service = new WarehouseService(); var host = new ServiceHost(service);You need to ensure that new operations do not wait for previous operations to finish. Which attribute should you use to decorate the service?（） You are developing a Windows Communication Foundation (WCF) service that does not operate on a duplex channel.You find that operations do not start until all previous operations have finished. The service hosting code contains the following lines.var service = new WarehouseService(); var host = new ServiceHost(service);You need to ensure that new operations do not wait for previous operations to finish. Which attribute should you use to decorate the service?（）

A、A. [ServiceBehavior(InstanceContextMode=InstanceContextMode.Single, ConcurrencyMode=ConcurrencyMode.Multiple)]  B、B. [CallbackBehavior(ConcurrencyMode=ConcurrencyMode.Multiple)]  C、C. [ServiceBehavior(InstanceContextMode=InstanceContextMode.Single, ConcurrencyMode=ConcurrencyMode.Single)]  D、D. [ServiceBehavior(InstanceContextMode=InstanceContextMode.Single, ConcurrencyMode=ConcurrencyMode.Reentrant)]  

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第2题
[单选题] A Windows Communication Foundation (WCF) client uses the following service contract.(Line numbers are included for reference only.) 01 [ServiceContract] 02 public interface IService 03 { 04 [OperationContract] 05 string Operation1（　）; 06 [OperationContract] 07 string Operation2（　）; 08 } You need to ensure that all calls to Operation1 and Operation2 from the client are encrypted and signed. What should you do?（）

A、Set the ProtectionLevel property in line 01 to EncryptAndSign.  B、Set the ProtectionLevel property in line 04 and line 06 to Sign.  C、Add a SecurityCriticalAttribute ror each operation.  D、Add a SecunitySafeCriticalAttribute for each operation.  

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第3题
[单选题] You are creating a Windows Communication Foundation (WCF) service that implements operations in a RESTful manner. You need to add a delete operation. You implement the delete method as follows:void DeleteItems(string id);You need to configure WCF to call this method when the client calls the service with the HTTP DELETE operation. What should you do?（）

A、Add the WebInvoke(UriTemplate="/Items/{id}", Method="DELETE") attribute to the operation  B、Add the HttpDelete atribute to the operation  C、Replace the string parameter with a RemovedActivityAction parameter  D、Replace the return type with RemovedActivityAction.  

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第4题
[] You are in charge of a towing vessel that operates exclusively on inland waters. You regularly tow barges that provide services (cargo lighters，fuel barges，etc.) to foreign flag vessels in port. What will be accepted as proper credentials for you and your crew? （）

A、A.No credentials are required since you operate on inland waters only  B、B.Social Security card  C、C.State driver's license with photo ID  D、D.Merchant Mariner's Document  

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第5题
[多选题] In which two cases would you perform only consistent backup？（）

A、You are working on a database where downtime is not tolerated.  B、You are working on a database where downtime can be tolerated.  C、You are working on a database that operates in ARCHIVELOG mode.  D、You are working on a database that operates in NOARCHIVELOG mode.  E、You are working on a database where all the tablespaces are locally managed.  F、You are working on a database where control files and redo log files are multiplexed.  H、You are working on a database where control files and redo log files are not multiplexed.  

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第6题
[单选题] Before a Flashback Table operation, you execute the following command: ALTER TABLE employees ENABLE ROW MOVEMENT; Why would you need this to be executed?（）

A、Because row IDs may change during the flashback operation  B、Because the object number changes after the flashback operation  C、Because the rows are retrieved from the recycle bin during the flashback operation  D、Because the table is moved forward and back to a temporary during the flashback operation  

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第7题
[单选题] 下面代码执行后，正确的输出结果是（）。

A、You are fired! You are hired!  B、You are fired! You are fired!  C、You are hired! You are hired!  D、You are hired! Youarefired!  

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第8题
[] You are using Recovery Manager (RMAN) for backup and recovery operations with a recovery catalog. You have been taken database backups every evening. On November 15, 2007, at 11:30 AM, you were informed that the USER_DATA tablespace was accidentally dropped. On investigation, you found that the tablespace existed until 11:00 AM, and important transactions were done after that. So you decided to perform incomplete recovery until 11:00 AM. All the archive logs needed to perform recovery are intact. In NOMOUNT state you restored the control file that has information about the USER_DATA tablespace from the latest backup. Then you mounted the database. Identify the next set of commands that are required to accomplish the task? （） You are using Recovery Manager (RMAN) for backup and recovery operations with a recovery catalog. You have been taken database backups every evening. On November 15, 2007, at 11

A、A. A  B、B. B  C、C. C  D、D. D  

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第9题
[单选题] Before a Flashback Table operation, you execute the following command: ALTER TABLE employees ENABLE ROW MOVEMENT; Why would you need this to be executed?（）

A、Because row IDs may change during the flashback operation  B、Because the object number changes after the flashback operation  C、Because the rows are retrieved from the recycle bin during the flashback operation  D、Because the table is moved forward and back to a temporary during the flashback opertion  

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第10题
[] You are developing a client application that consumes a Windows Communication Foundation (WCF) service. You use the svcutil.exe utility to create a proxy for the service. You use the svcutil.exe switches that generate asynchronous calls. GetFlight is a service operation that takes no parameters and returns a string. The GetFlightCallback method must be called when the service operation returns.You create an instance of the client proxy with the following code:var client = new TranvelServiceClient();You need to ensure that a callback is received when the GetFlight operation is called asynchronously. Which code segment should you use?（） You are developing a client application that consumes a Windows Communication Foundation (WCF) service. You use the svcutil.exe utility to create a proxy for the service. You use the svcutil.exe switches that generate asynchronous calls. GetFlight is a service operation that takes no parameters and returns a string. The GetFlightCallback method m

A、A. client.BeginGetFlight(GetFlightCallback, null); client.GetFlight();  B、B. client.GetFlight(); client.BeginGetFlight(GetFlightCallback, null);  C、C. client.GetFlightCompleted += new EventHandler(GetFlightCallback); client.GetFlightAsync();  D、D. IAsyncResult asyncResult = client.BeginGetFlight(GetFlightCallback, client); client.EndGetFlight(asyncResult);  

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