It has been believed that the basis of general-knowledge education is the theory of its practice and the key is its epistemology.
认为通识教育研究的基础是通识教育实践论，关键是通识教育认识论。
Canadian Helicopter Written Test Guide: Theory of Flight, General Knowledge Section ;
加拿大直升机笔试指导：理论飞行常识科 ；
Canadian Helicopter Written Test Guide: Theory of Flight, General Knowledge Section ;
加拿大直升机笔试指导：理论飞行常识科 ；
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