1..贮煤地层的岩石类型,一般是()
A.侵入岩 | B.喷出岩 | C.沉积岩 | D.变质岩 |
A.变质岩、岩浆岩和沉积岩 | B.沉积岩、岩浆岩和变质岩 |
C.岩浆岩、变质岩和沉积岩 | D.岩浆岩、沉积岩和变质岩 |
A. | B. | C. | D. |
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