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胎儿生长参数对照表
基于权威共识的胎儿发育指标参考工具，提供孕周双顶径、头围等关键参数标准范围
孕龄计算器
通过末次月经日期或超声指标（CRL/BPD/HC/FL等）精确计算胎儿孕周，辅助评估预产期和发育阶段。
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