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WebJan 13, 2013 · 关注 展开全部 不一样的事情周期天数都不一样，至于周期这个词，在中文中有特别的意思，就是指一个星期 ，但是一般不这样用， 只有在很特别的地方才会认为被这样用，指月经周期正常的话为28-30天，也有些女生的月经周期相对较长或者有不规律的情 … WebThe Mathematics 1 course, often taught in the 9th grade, covers Linear equations, inequalities, functions, and graphs; Systems of equations and inequalities; Extension of the concept of a function; Exponential models; Introductory statistics; and Geometric transformations and congruence. Khan Academy's Mathematics 1 course is built to … children of men long shot scene

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