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. Porridge.            B. Bread.                    C. Sausages.
_____) 2. A. Yes, he doesn’t.      B. Yes, she does.               C. No, he doesn’t.
_____) 3. A. Yes, there is.            B. No, we need to buy some.  C. Yes, there aren’t.
_____) 4. A. Yes, we must.        B. No, we mustn’t.         C. Yes, we can.
_____) 5. A. It’s Thursday.           B. It’s 6th November.        C. It’s sunny.
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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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