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:0.85
所属科目:小学英语
根据所听到的内容,选出相应的答语,听两遍。
(      )1. A. Yes, there are.             B. Yes, they are.        C. Yes, there is.
(      )2. A. It’s on the table.          B. No, it isn’t.            C. They’re on the table.
(      )3. A. There is three.            B. There are 18.          C. It’s 80.
(      )4. A. I like watching films.     B. He likes drawing.     C. He likes animal friends.
(      )5. A. Yes, they do.                 B. No, it doesn’t.        C. Yes, he does.
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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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