1.在下列月份中,箭头a代表的补给主要发生在
A.1~2月 | B.3~4月 | C.6~7月 | D.11~12月 |
A.冰川、地下水 | B.雨水、地下水 |
C.雨水、海洋水 | D.海洋水、冰川 |
A.丰水期a变小,枯水期b变大 | B.丰水期a变小,枯水期b变小 |
C.丰水期a变大,枯水期b变小 | D.丰水期a变大,枯水期b变大 |
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