本实验选取航空发动机涡轮叶片中段内部冷却通道为研究对象，对不同肋间距的横肋变截面U型通道的换热特性进行了研究。
The experiment has studied the heat transfer characteristic inside U shaped variable cross-section channels with different rib pitches, The channel is the middle part of a gas turbine blade.
调查结果显示：1）内部动机与外部动机的九小类型均存在于中学生的学习中；
The results of the study are summed up as follows:1) All the 9 subtypes of internal and external motivation exist in the process of students' learning.
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