学生选课系统课程类学生类和测试类的英文类图

以下是学生选课系统的课程类、学生类和测试类的英文类图：

Class Diagram:

+-----------------+          +-----------------+          +-----------------+
|    Course       |          |    Student      |          |      Test       |
+-----------------+          +-----------------+          +-----------------+
| - courseId      |          | - studentId     |          | - testId        |
| - courseName    |          | - studentName   |          | - testName      |
| - courseCredit  |          | - studentMajor  |          | - testScore     |
| - courseTeacher |          | - studentGrade  |          | - testDate      |
+-----------------+          +-----------------+          +-----------------+
| + setCourseId() |          | + setStudentId()|          | + setTestId()   |
| + setCourseName()|         | + setStudentName()|         | + setTestName() |
| + setCredit()   |          | + setMajor()    |          | + setScore()    |
| + setTeacher()  |          | + setGrade()    |          | + setDate()     |
| + getCourseId() |          | + getStudentId()|          | + getTestId()   |
| + getCourseName()|         | + getStudentName()|         | + getTestName() |
| + getCredit()   |          | + getMajor()    |          | + getScore()    |
| + getTeacher()  |          | + getGrade()    |          | + getDate()     |
+-----------------+          +-----------------+          +-----------------+

注意：以上类图是一个简单的示例，仅供参考。实际上，学生选课系统可能需要更多的类和属性来实现其功能。