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少子化
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少子化
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少子化
一个社会中随着人口总和生育率下降,少年儿童(0-14岁)占总人口比重降低的现象。一般将一个国家的总和生育率长时间低于维持人口长期稳定发展的更替水平(2.1),界定为少子化。
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height of a cylinder
height of a Diophantine equation
height of a field
height of a group
height of an algebraic number
height of an algebraic point
height of an algebraic variety
height of an element
height of an elliptic curve
height of an ideal
height of a pyramid
height of a rectangle
height of a triangle
height of disappearance
height of median energy,HOME
height of water avoidance
height plane
height scale
height system
Heihe Aihui Exhibition Hall of History
Heihe Daxiagu
Heihe Educated Youth Museum
Heihe Museum
Heihe Shi
Hei He Water Diversion Project
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