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点P（3，-5）关于原点对称的点的坐标为______．
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【简答题】若 n 为主串长, m 为子串长,则用简单模式匹配算法最好情况下,需要比较字符总数是( ) ,最坏情况下,需要比较字符总数是( ) 。
【简答题】Dear Peter, My name is Frank．I am from（来自）America．Here is a picture of my class（班）．We are in Class One, Grade Seven． You can see my friends in the picture．Jimmy likes to play basketball．He likes to ea...
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