学进去-教育应平等而普惠
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难度系数:0.65
所属科目:小学英语
听录音,根据所听内容及问题选择正确的答案。听两遍。
(     ) 1. A. Some milk.          B. Some juice.      C. Some water.
(     ) 2. A. It’s windy.            B. It’s fine.                 C. It was rainy.
(     ) 3. A. She’s 35 kg.               B. She’s 15 kg.             C. She’s 30 kg.
(     ) 4. A. Yes, he did.           B. No, he didn’t.          C. Yes, he is.
(     ) 5. A. A student.                 B. A singer.                 C. A scientist.
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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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