科目四
科目四-
教师种群中的班主任、主科任课教师、小学科任课教师和非考试科目任课教师四个亚种群，依据其在本研究中占据的班级中的实际权重分别进行探讨。
Head teacher , main-subject teachers , small-subject teachers and non-examination-subject teachers in the teacher population are four sub-populations of teachers , according to their occupied in this study , and their actual weights in class Z are discussed separately .