学进去-教育应平等而普惠
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类型:听音,选择正确答案
难度系数:0.65
所属科目:小学英语
听音,选出正确的答语。
(       ) 1. A. New York.            B. Canberra.            C. Washington, D.C.   
(       ) 2. A. It’s 278 kilometers.   B. It’s not far.       C. By train.
(       ) 3. A. Yes, we did.        B. No, we don’t.        C. Hooray.
(       ) 4. A. We will go to Shanghai. B. We can go there by plane. C. We will go to Shanghai on January 20.
(       ) 5. A. We eat Zongzi.   B. We watch the moon and eat moon cakes.   C. We need some food.
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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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