1.“滇池水脏”与滇池水体更新周期长有关。滇池水体更新周期长的主要原因有
A.流域面积小,汇入水量少 | B.季风气候,径流季节变化大 |
C.水体总量大,进出水量小 | D.全年高温,湖水蒸发量大 |
A.改变滇池流域降水总量 | B.提高滇池水体自净能力 |
C.减少昆明污染物排放总量 | D.缓解昆明用水紧张状况 |
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