(1)“滚滚长江东逝水”和“君不见,黄河之水天上来,奔流到海不复回”这两句诗词均描写了长江和黄河自西向东的流向,这说明我国地势
(2)自河口到桃花峪,黄河干流年平均含沙量逐渐增大,这说明黄河的泥沙主要来自
(3)长江、黄河共同发源的省区是
(4)长江被誉为我国“水能宝库”,在长江干支流上建有许多大型水电站,图中A是世界上最大的
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