【简答题】L__________ back on(回顾) my twenty years’ teaching in high school, I attributed my success to patience, talent, and the constant pursuit of knowledge.
【简答题】____my twenty years’ teaching in high school, I attributed my success to patience, talent, and the constant pursuit of knowledge. (taking over, looking back on, standing for, being bathed in)
【简答题】设Y x 、Z x 、U x 分别是下列差分方程的解 y x+1 +ay x =f 1 (x),y x+1 +ay x =f 2 (x) y x+1 +ay x =f 3 (x) 求证:V x =Y x +Z x +U x 是差分方程y x+1 +ay x =f 1 (x)+f 2 (x)+f 3 (x)的解.
【简答题】_____________________________(回顾) my twenty years’ teaching in high school, I attributed my success to patience, talent, and the constant pursuit of knowledge.