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. The maths book is on tie teacher’s desk.        B. The English book is on the teacher’s desk.
(     ) 2. A. Let me clean the floor.        B. Let me clean the windows.
(     ) 3. A. This is the new classroom. The door is orange.        B. This is the new computer room. The door is orange.
(     ) 4. A. I have a good friend. She is thin and has long hair.        B. I have a good friend. She is a cute girl.
(     ) 5. A. I have two notebooks and some candies on my desk.        B. I have three keys and some notebooks on my desk.
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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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