To generate recommendations to improve the performance of a set of SQL queries in an application, you execute the following blocks of code:<br /> <img src="https://nimg.ppkao.com/2018-08/yiyu/2018080209233225791.jpg?sign=c807d6c2e29526f65a7106a36d1019cf&t=62d4a723" /><br /> The blocks of code execute successfully; however, you do not get the required outcome. What could be the reason?（）..

第1题

[单选题] Which is a function of the voltage regulators used with AC generators?（）

A、To cut out generators when they are no longer required B、To cut in additional generators automatically as required C、To divide the KW load equally between generators operating in parallel D、To divide reactive current between generators operating in parallel

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第2题

[单选题] The purpose of DC generator brushes is to （）.

A、neutralize armature reaction B、conduct electric current to an outside circuit C、convert DC current to AC current D、provide excitation to a DC generator

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第3题

[单选题] Most often （） is attached to the engine-propeller shaft for efficient electric power generation.

A、a variable-speed AC generator B、a fixed-speed AC generator C、an air blower D、a DC generator

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第4题

[] You need to modify a client application that consumes a Windows Communication Foundation (WCF) service. The service metadata is no longer available. You need to modify the previously generated proxy to include asynchronous calls to the service. What should you do? （） You need to modify a client application that consumes a Windows Communication Foundation (WCF) service. The service metadata is no longer available. You need to modify the previously generated proxy to include asynchronous calls to the service. What should you do? （）

A、A. Update the service reference with the Generate asynchronous operations option. B、B. Create a partial class for the previously generated proxy and include the new asynchronous methods. C、C. Create a class with the same name as the previously generated proxy and add the new asynchronous methods. Add the new class to a namespace that is different from the original proxy. D、D. Create a class with the same name as the previously generated proxy and add the new asynchronous methods as partial methods. Add the new class to a namespace that is different from the original proxy.

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第5题

[] You develop a Windows Communication Foundation (WCF) service to generate reports. Client applications call the service to initiate report generation but do not wait for the reports to be generated. The service does not provide any status to the client applications. The service class is defined as follows. (Line numbers are included for reference only.) 01 [ServiceContract] 02 public class ReportGeneratorService 03 { 04 ... 05 private int GenerateReports(int clientID) 06 { 07 ... 08 return 0; 09 } 10 } You need to ensure that client applications can initiate reports without waiting for status. Which two actions should you perform (Each correct answer presents part of the solution. Choose two.) （）。 You develop a Windows Communication Foundation (WCF) service to generate reports. Client applications call the service to initiate report generation but do not wait for the reports to be generated. The service does not

A、A. Insert the following code at line 04. [OperationContract(IsOneWay=true)] B、B. Insert the following code at line 04. [OperationContract(AsyncPattern=false)] C、C. At line 05, change the GenerateReports method from private to public. D、D. Remove line 08. At line 05, change the return type of GenerateReports method to void.

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第6题

[单选题] A DC generator is used to supply direct current in order to maintain an AC generator field and is known as a/an （）

A、rotor B、stator C、exciter D、armature

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第7题

[单选题] The hydrocarbons they do emit are less likely to（）ozone.

A、general B、generation C、generate D、generous

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第8题

[多选题] Which two statements about sequences are true? （）

A、You use a NEXTVAL pseudo column to look at the next possible value that would be generated from a sequence, without actually retrieving the value. B、You use a CURRVAL pseudo column to look at the current value just generated from a sequence, without affecting the further values to be generated from the sequence. C、You use a NEXTVAL pseudo column to obtain the next possible value from a sequence by actually retrieving the value from the sequence. D、You use a CURRVAL pseudo column to generate a value from a sequence that would be used for a specified database column. E、If a sequence starting from a value 100 and incremented by 1 is used by more then one application, then all of these applications could have a value of 105 assigned to their column whose value is being generated by the sequence. F、You use REUSE clause when creating a sequence to restart the sequence once it generates the maximum value defined for the sequence.

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第9题

[多选题] Which two statements about sequences are true?（）

A、You use a NEXTVAL pseudo column to look at the next possible value that would be generated from a sequence, without actually retrieving the value. B、You use a CURRVAL pseudo column to look at the current value just generated from a sequence, without affecting the further values to be generated from the sequence. C、You use a NEXTVAL pseudo column to obtain the next possible value from a sequence by actually retrieving the value from the sequence. D、You use a CURRVAL pseudo column to generate a value from a sequence that would be used for a specified database column. E、If a sequence starting from a value 100 and incremented by 1 is used by more then one application, then all of these applications could have a value of 105 assigned to their column whose value is being generated by the sequence. F、You use REUSE clause when creating a sequence to restart the sequence once it generates the maximum value defined for the sequence.

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第10题

[多选题] Which two statements about sequences are true? （）

A、You use a NEXTVAL pseudo column to look at the next possible value that would be generated from a sequence, without actually retrieving the value. B、You use a CURRVAL pseudo column to look at the current value just generated from a sequence, without affecting the further values to be generated from the sequence. C、You use a NEXTVAL pseudo column to obtain the next possible value from a sequence by actually retrieving the value from the sequence. D、You use a CURRVAL pseudo column to generate a value from a sequence that would be used for a specified database column. E、If a sequence starting from a value 100 and incremented by 1 is used by more then one application, then all of these applications could have a value of 105 assigned to their column whose value is being generated by the sequence. F、You use REUSE clause when creating a sequence to restart the sequence once it generates the maximum value defined for the sequence.

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