string is composed ofn(20) characters in an orderly sequence recorded as s:“c1C2C3…Cn” S is string name c123n is value is a character n is string length Such as,S=“ TSinghua University
Teaching madel Target language input Engagement Model of classroom Learner's active seard Implementation Learner's comprehensive output Negative input from teacher
A clotheshorse讲究穿戴的人 one' s brain child某人的主意,某人想出来的 Princess Diana was a real clotheshorse. It's hard to imagine how much 等同于 one's original idea she had spent on clothes
4. 广义笛卡尔积 (Extended Cartesian Product Extended Cartesian Product) z R – n目关系,k1个元组 z S – m目关系,k2个元组 z R×S – 列:(n+m)列的元组的集合 z 元组的前n列是关系R的一个元组 z 后m列是关系S的一个元组 – 行:k1×k2个元组
profit maximization Content: Some definition Isoprofit curve Demand function and it's properties supply function and it's properties Profit function and it's properties