“sex ratio at birth”的概念、定义、翻译、参考文献-科学参考

单词	sex ratio at birth
释义	sex ratio at birth Encyclopedia 法学生育率释 sex ratio at birth出生性别比在特定的时间和空间范围内出生时的活产男婴数与活产女婴数之比。又称出生人口性别比、第一性别比。
随便看	parallel-laid lapping parallel line and plane parallel lines parallellines parallel machine scheduling parallel match parallel mechanism parallel memory parallel model parallel modeling parallel molecular genetic analysis parallel momentum parallel multistep method parallel of altitude parallel of declination parallel of latitude parallelogram parallelogram axiom parallelogram identity parallelogram illusion parallelogram law parallelogram linkage parallelogrammatic number parallelogram of periods parallelogram polyomino

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