Paired sample t test method was used to compare the difference between the two explants of the same trees. Independent sample t test method was used to determine the difference between the two groups.

用成对样本t检验法比较同一无性系内两种外植体的差异用成组样本t检验法比较两组无性系间的差异。

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Result test: Prepare the questionnaire, and utilize the paired sample t to test the difference of class management ability before and after in-post practice.

效果检验：编制调查问卷，利用配对样本t检验方法检验顶岗前后班级管理能力差异。

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