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。
The results show that : the male undergraduates′degree of social support are higher than that of females but there aren′t difference between the both and theirs are same in the model .
结果显示： 研究对象的男性比女性社会支持程度略高，但没显著性差异；
The air temperature of the same season in different patterns of farmland is different t, this difference is mainly caused by the cover of different vegetation.
不同退耕模式同一季节大气温度有差异，这种差异主要是植被覆盖的不同引起的。
The air temperature of the same season in different patterns of farmland is different t, this difference is mainly caused by the cover of different vegetation.
不同退耕模式同一季节大气温度有差异，这种差异主要是植被覆盖的不同引起的。
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