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
根据你所听到的对话和问题,选出正确的答案,读两遍。
(     ) 1. A. His cousin Alice.                    B. He went there by bus.              C. He liked animals.
(     ) 2. A. 10 years ago.                    B. 20 years ago.                    C.30 years ago.
(     ) 3. A. No, they went to the zoo.        B. Yes, they were.                    C. No, they picked apples.
(     ) 4. A. She's getting tired.             B. She's getting fat.                    C. She's getting black.
(     ) 5. A. Fine.                                  B. Cold                                  C. Cloudy.
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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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