“child aged ratio”的概念、定义、翻译、参考文献-科学参考

单词	child aged ratio
释义	child aged ratio Encyclopedia 法学年龄释 child aged ratio老少比总人口中老年人口数与少儿人口数之比。一般以百分数表示。
随便看	p-p cycle pp cycle PPD PPDL PPE P-persistent carrier sense multiple access P-persistent carrier sense multiple access, P-persistent CSMA P-persistent CSMA ppf PPFF ppg PPH pph p phenylaniline p-phenylaniline p-phenylene p phenylenediamine p-phenylenediamine p-phenylene oxide p-phenylene sulfide pphm p phthalic acid p-phthalic acid PPI ppioid receptor partial agonists

科学参考收录了854744条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。