下图为H地区地理位置示意图,该地区是我国城市分布最密集、经济发展水平最高的地区。读图完成下面小题。
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1.如果把长江比作“箭”,把东部沿海比作“弓”,则位于“箭头”位置的H是( )
A.珠江三角洲 | B.京津唐地区 | C.黄河三角洲 | D.长江三角洲 |
A.东海 | B.渤海 | C.北海 | D.南海 |
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同类型试题
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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
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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
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