学进去-教育应平等而普惠
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难度系数:0.65
所属科目:小学英语
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(     ) 1. A. It’s January.                    B. It’s in January.          C. I am happy.
(     ) 2. A. I am watching TV.       B. I am hard-working.          C. I often clean my room.
(     ) 3. A. No, I’m not.               B. No, he isn’t.                    C. Yes, she is.
(     ) 4. A. They’re Zoom’s.        B. This is Zoom.                  C. It’s Zoom’s.
(     ) 5. A. They’re cute.             B. They’re drinking water. C. They play with a ball.
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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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