單項選擇題

You work as an application developer at Certkiller .com. You are developing an application that makes use of a Queue class object named MyQueue. This Queue class object will be used to store messages sent by the user during application run time.You would like to access the message at the beginning of the queue， prior to processing the user messages， without removing it. What should you do？（）

A. Use the Enqueue method of the MyQueue object.
B. Use the Contains method of the MyQueue object.
C. Use the Dequeue method of the MyQueue object.
D. Use the Peek method of the MyQueue object.

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單項選擇題

You work as an application developer at Certkiller .com. You are developing an application that makes use of a Queue class object named MyQueue. This Queue class object will be used to store messages sent by the user during application run time. The application that you are developing provides an interface for administrators and an interface for users to create message reports.You want to ensure that all user messages stored in the MyQueue object are removed when an administrator selects the reset option.What should you do？（）

A. Use the Enqueue method of the MyQueue object.
B. Use the Clear method of the MyQueue object.
C. Use the Dequeue method of the MyQueue object.
D. Use the TrimToSize method of the MyQueue object.

多項選擇題

You work as an application developer at Certkiller .com. Certkiller .com has instructed you to create a class named MetricFormula. This class will be used to compare MetricUnit and EnglishUnit objects.The MetricFormula is currently defined as follows （Line numbers are used for reference purposes only）： 1. public class MetricFormula2. { 3. 4. } You need to ensure that the MetricFormula class can be used to compare the required objects. What should you do？（）

A. Add the following code on line 1：： IComparable {
B. Add the following code on line 1：： IComparer {
C. Add the following code on line 3： public int Compare （object x， object y） {// implementation code }
D. Add the following code on line 3： public int CompareTo （object obj） {// implementation code }

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