[[QOrDeR]]西南地区发生旱灾的主要原因有
A.属于湿润地区,农业用水量过大 | B.降水较常年同期偏少 |
C.属于干旱地区,水资源不足 | D.气温较常年同期偏高,蒸发量大 |
A.暴雨引发洪水.建立预警系统 | B.雨季降水形成洪水.修建水库 |
C.积雪融化引发洪水.疏浚河道 | D.来自上游的洪水.修堤筑坝 |
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