【单选题】【消耗次数：1】
从世界范围看，年轻人口型国家中，少年儿童占（ ）。
①
30%
②
40%
③
30%~40%
参考答案：
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相关题目
【单选题】
已知A、B、C三点坐标分别为（10、20、30）（20、40、60）、（30、60、90），则A、B、C三点______。
①
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7.8 磅
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②
Normal
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7.8 磅
0
2
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EN-US
ZH-CN
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不能表示一个平面
③
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7.8 磅
0
2
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④
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无法判断
随机题目
【判断题】
污水处理厂的长治一般应设于污水能自流入场内的第十较低处并位于城镇水体下游，与居民区有一定隔离带，主导风向下方，不能被洪水浸淹，地质条件好，地形有坡度。
①
正确
②
错误