学进去-教育应平等而普惠
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类型:听音,选择正确答案
难度系数:0.65
所属科目:小学英语
听短文,选择正确的答案。
(      ) 1. Lily is from the _____.
A. UK                           B. USA
(      ) 2. Lily is _____.             
A. tall and thin              B. short and thin
(      ) 3. Lily has a big _____.       
A. study                    B. bedroom
(      ) 4. Lily’s bedroom is _____.       
A. big                           B. beautiful
(      ) 5. Lily’s mother is in the _____.        
A. bedroom               B. kitchen
(      ) 6. Lily’s mother is my new _____ teacher.   
A. maths       B. English
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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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