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. Put your eraser near your pencil.       B. Put your pencil near your eraser.
(        ) 2. A. He’s tall and friendly.                           B. He’s tall and strong.
(        ) 3. A. My uncle is a cook.                           B. My aunt is a cook.
(        ) 4. A. Where are the toys?                           B. Where are the keys?
(        ) 5. A. Pass me a knife, please.                    B. Pass me a spoon, please.
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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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