[名词解释] DNB比 DNB ratio(DNBR)
[名词解释] P/O比(P/O ratio)
[名词解释] 人流活产比(ratio of induced abortion and live birth)
[名词解释] 儿童妇女比(child-women ratio)
[单选题]The following diagram denotes dependency between two activities A and B,It says()A.B can’t start before A is finishedB.B can’t finish before A is finishedC.B can’t start before A startsD.B can’t finish before A starts
[名词解释] 老年人口负担系数(老年抚养比)
[问答题]材料一人口抚养比是指人口中非劳动年龄人口与劳动年龄(15~64岁)人口数之比,当总抚养比≤50%时称为人口红利期。下图示意1980--2030年我国少
[单选题]对老年抚养比描述不正确的是()。A . 指65岁及以上老年人口数与15-64岁劳动年龄人口数之比B . 目前我国老年抚养比已超过20%C . 老年抚养比并不影响人口红利D . 预计到2050年老年抚养比将增加到50%
[单选题]关于我国五省市人口抚养比(人口抚养比是指非劳动年龄人口数与劳动年龄人口数的比)的叙述正确的是( )。A.贵州的老年人口抚养比最大B.上海的老年人口抚
[单选题]If the ratio of brown cars to blue cars in a certain parking lot is 2:3, how many brown cars are in the lot?(1) There are 15 blue cars in the lot.(2) There are 25 cars total in the lot.