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:0.40
所属科目:小学英语
听情景与问题三遍,选择最佳答案回答问题,把其编号写在括号内。
(     ) 1. A. ¥8.                                  B. ¥10.                                  C. ¥18.
(     ) 2. A. It’s hot.                                  B. It’s cold.                            C. It’s warm.
(     ) 3. A. Watch TV.                            B. Visit friends.                     C. See a film.
(     ) 4. A. Something hot.                     B. Something cold.                     C. A can of coke.
(     ) 5. A. Drawing pictures.                     B. Collecting stamps.               C. Keeping pets.
(     ) 6. A. Yes, she does.                     B. No, she doesn’t.                     C. The fish is delicious
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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

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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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