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

The Lantern Festival(元宵节) is a popular festival in C1.. It is in February or M2. fourteen days a3. the Spring Festival. People usually go to w4. colourful lanterns on the streets or in the p5.. There are many lanterns. Children often hold little lanterns in their hands. They’re very excited. Sometimes, we can watch fireworks (烟花) at n6.. They are so beautiful. At the festival, people eat tangyuan. In China, people a7. call it yuanxiao. This food means family reunion (团圆) and happiness.

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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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