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
听录音,根据句子选择正确的答语。(听两遍)
(     ) 1. A. Yes, she did.       B. She bought some books about space travel.     C. She bought them in the supermarket.
(     ) 2. A. I bought a T-shirt.       B. Yes, I have.       C. No, I didn't.
(     ) 3. A. Daming bought him a book.       B. Daming asked him to read books.       C. No, he didn't.
(     ) 4. A. Yes, I can.       B. No, I'm not.       C. Yes, I do.
(     ) 5. A. They thanked her.       B. They finished the book.       C. They gave her a present.
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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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