【多选题】【消耗次数：1】
实施三孩生育政策及配套支持措施，有利于未来保持适度人口总量和劳动力规模，更好发挥人口因素的（）作用，为高质量发展提供有效人力资本支撑和内需支撑。
①
A、基础性
②
B、全局性
③
C、关键性
④
D、战略性
⑤
E、有效性
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