学进去-教育应平等而普惠
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难度系数:0.85
所属科目:小学英语
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(     ) 1. A. She is cooking.     B. He is having dinner. C. She is in the kitchen.
(     ) 2. A. I’m going to the zoo.     B. I went to the park.     C. I go to the park.
(     ) 3. A. It’s December 25.     B. It’s January 1.     C. It’s September 10.
(     ) 4. A. Yes, I think he can.     B. No, I don’t.     C. Yes, I think I can.
(     ) 5. A. We have PE in the morning.     B. We have four classes in the morning.     C. We have English and math in the morning.
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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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