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人口机会窗口
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人口机会窗口
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population opportunity window
人口机会窗口
总人口“中间大,两头小”的结构,使得劳动力供给充足,而且社会负担相对较轻,对社会经济发展十分有利的时期。所谓“中间大”,是指15~64岁的劳动适龄人口规模大;所谓“两头小”,是指0~14岁的青少年人口和65岁及以上的老年人口规模小。
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freshwater mussels
freshwater offspring breeding
freshwater ornamental fish
freshwater seed breeding
freshwater seed culture
freshwater shellfish breeding
freshwater shellfish fungal diseases
freshwater shellfish seed culture
freshwater shellfish viral diseases
freshwater species
fresh water storage works
freshwater unionids
Fresnel
fresnel
Fresnel approximation
Fresnel, Augustin-Jean
Fresnel bimirror
Fresnel biprism
Fresnel diffraction
Fresnel diffraction by a circular aperture
Fresnel diffraction by a circular obstacle
Fresnel diffraction by a straight edge
Fresnel double mirror experiment
Fresnel double prism experiment
Fresnel elastic surface
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