1.甲地区与乙地区的地理界线大致是( )
A.秦岭——淮河 | B.南岭——长江 | C.秦岭——黄河 | D.南岭——珠江 |
A.渔业 | B.旱作农业 | C.畜牧业 | D.水田农业 |
A.植被茂密 | B.夏季低温 | C.干旱少雨 | D.河网密布 |
A.温州水牛 | B.三河马 | C.哈萨克羊 | D.牦牛 |
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