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类型:选内容补全对话
难度系数:0.85
所属科目:小学英语
build     wall     tall     famous     visit

The Great Wall of China is the longest wall in the world.

It is about 20,000 kilometers long, 7 meters 1. and 5 meters wide. The Great Wall was built more than twenty centuries ago. It was very difficult to 2. such a great wall without any modern machines. Thousands of men died while they were building the 3..

Have you ever been to the Great Wall? It is very 4. in the world. Many foreigners come to 5. it every year. They like it very much.

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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

用户名称
2019-09-19

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

用户名称
2019-09-19
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