“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	open interval Open interview open kernel Open Knowledge International open leveling line open logic open loop open-loop open loop control open-loop control open-loop controlled circuit open-loop control system open-loop control systems open loop experiment open loop guidance open-loop pressurization open loop servo system open-loop system open-loop test of flight control system open magnet unit open management department of museum open manifold open mapping open mapping theorem open market operations

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