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using System;
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using System.Data;
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using System.Collections;
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using System.Data.SqlClient;
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using OnLineExam.DataAccessLayer;
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using OnLineExam.DataAccessHelper;
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namespace OnLineExam.BusinessLogicLayer
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{
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//考试科目类
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public class Course
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{
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#region 私有成员
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private int _ID; //题目编号
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