库布齐沙漠是世界上迄今唯一被整体治理的沙漠,被联合国确定为“全球治沙样本”。如图是库布齐沙漠分布图,读图完成下列小题。
1.库布齐沙漠地处黄河( )
A.上游 | B.中游 | C.下游 | D.入海口 |
A. | B. | C. | D. |
A.植树种草 | B.打坝淤地 | C.加固堤坝 | D.退耕还湖 |
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