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每届学生都有不同程度的差异。学生的学习成绩“优、良、中、差”均有不同比例的存在。简明扼要地介绍了实际工作中的教学事实。
Each student has varying degrees of difference. Students’ academic performance “good, good, good, bad ” have different proportions of existence. Briefly introduced the teaching facts in practical work.