读下列四幅景观图片,完成下面小题。
1.四幅图片所示地貌中,主要由沉积作用形成的是( )
A.①② | B.②③ | C.③④ | D.①④ |
a.长江三峡 b.长江三角洲 c.冲积扇 d.塔里木盆地的沙丘
e.喀斯特地貌 f.河流下切作用形成的沟谷
A.aef | B.bce | C.cdf | D.ace |
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