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【单选题】

The simplest method to use for determining if a centrifugal pump is operating as designed, is to （）.

A、closely observe the pump discharge temperature

B、close off the discharge valve, and watch for a rise in pressure

C、momentarily close off the suction valve, and watch for a rise in pressure

D、use a clamp on ammeter and compare the readings to past records

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第1题
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第2题
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第3题
[单选题] 你创建一个DirectorySecurity对象为工作目录。你需要确定用户帐户和组具有读取和写入权限。你应该使用DirectorySecurity对象的哪种方法？（）

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第4题
[单选题] Which methods from the String and StringBuffer classes modify the object on which they are called？（）  

A、The charAt（） method of the String class.  B、The toUpperCase（） method of the String class.  C、The replace（） method of the String class.  D、The reverse（） method of the StringBuffer class.  E、The length（） method of the StringBuffer class.  

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第5题
[单选题] You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4 to create an application. The application uses the LINQ ParallelEnumerable. AsParallel method to perform multiple queries on a database. You need to ensure that queries can execute on separate threads concurrently. What should you do? （）

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第6题
[] You are developing a Windows Communication Foundation (WCF) service. You write a method named Submit that accepts messages of the type System.ServiceModel.Channels.Message. You need to process the body of the incoming messages multiple times in the method. Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)（）

A、A. Use the GetBody method of the Message class to read the content of the messages.  B、B. Use the CreateBufferedCopy method of the Message class to load the messages into memory.  C、C. Use the WriteBodyContents method of the BodyWriter class to make a copy of the messages.  D、D. Use the CreateMessage method of the MessageBuffer class to make a copy of the messages.  

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第7题
[单选题] It is desirable that a certain method within a certain class can only be accessed by classes that are defined within the same package as the class of the method. How can such restrictions be enforced？（）  

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第8题
[单选题] When general cargo with different amounts in each draft is involved，the checker must use the （）.

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第9题
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