学进去-教育应平等而普惠
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类型:填内容补全对话
难度系数:0.65
所属科目:小学英语
rowed     Lake     took     train     had     holiday     bought     went     saw     second

I went to Hangzhou on my 1.. I went there by 2..

On the first day, I visited the West 3. with my parents. We 4. a boat and 5. many pictures. We 6. shopping. I 7. some presents for my friends. On the 8. day, we went to a zoo. We 9. many animals. They were cute. I 10. a lot of fun on my holiday.

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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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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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