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
听录音,选择正确的答语,听两遍。
(      ) 1. A. I’d like some soup.              B. Help yourself.                    C. Thank you.
(      ) 2. A. Here you are.                    B. I don’t like beef.                    C. Yes, please.
(      ) 3. A. Three.                                  B. I have ten.                           C. There are many desks.
(      ) 4. A. Yes, it is.                           B. Yes, they are.                    C. No, they aren’t.
(      ) 5. A. She’s a doctor.                    B. He’s a doctor.                    C. She’s a nurse.
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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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