“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	photoelectric photoelectric absolute magnitude photoelectric absorption photoelectric absorption coefficient photoelectric astrolabe photoelectric astrometry photoelectric cathode photoelectric cell photoelectric cell, photocell photoelectric colorimeter photoelectric conversion photo-electric conversion efficiency photoelectric conversion efficiency photo-electric conversion efficiency of solar cell photoelectric conversion material photoelectric converter photoelectric current photoelectric current sensor photoelectric detection photoelectric digital sunshine recorder photoelectric diode photoelectric direct reading spectrometer photo electric effect photo-electric effect photoelectric effect

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