“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	opera frescoes at Peking Jingzhong Assosiation opera frescoes unearthed at Yuan tomb of XilizhuangVillage, Yuncheng City opera guild opera house opera house in Guangdong Guild Hall(Tian Jin) opera house in Lanzhou Baiyun Taoist Temple opera house in the City God Temple of New Jiangxian County opera imaginativeness Opera Improvement Bureau of the Ministry of Culture Opera Improvement Committee of the Ministry of Culture opera manuscripts and block-printed editions opera masks of the Qing court operameter opera monument of Foshan Xujiang North Emperor Temple opera murals of the Yanshan Temple in Fanzhi County opera music operand operant behavior operant conditioned reflex operant conditioning operant extinction opera of soviet area opera of the Ming Dynasty opera painting opera performance

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