年份 | 常住人口数量(万人) | 人口自然增长率(%) | 城镇化率(%) | 各年龄段人口所占比例(%) | |||
0-15岁 | 16-69岁 | 60岁及以上 | 65岁及以上 | ||||
2020年末 | 6468 | 1.29 | 67.7 | 14.3 | 67 | 18.7 | 13.3 |
2021年末 | 6640 | 1 | 72.7 | 14.1 | 66.8 | 19.1 | 14.2 |
A.①② | B.①③ | C.②④ | D.③④ |
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2