①甲线以南为湿润区,植被以亚热带常绿阔叶林为主 ②乙线大致我国200mm等降水量线一致 ③丙线经过的主要山脉有大兴安岭—太行山—巫山—武夷山 ④丁线为我国第一级阶梯与第二级阶梯分界线⑤戊线的起止点为黑龙江漠河和云南腾冲
A.①②④ | B.①④⑤ | C.②③④ | D.②③⑤ |
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