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
听录音,根据所听对话,选择正确的答案。
(     ) 1. Where were Wang Bing and his friends yesterday?
A. In the park.                  B. At home.                              C. At school.
(     ) 2. How did Liu Tao get news five years ago?
A. He read newspapers.       B. He watched news on TV.            C. He read it on the Internet.
(     ) 3. What could Yang Ling do ten years ago?
A. She could sing.               B. She could read.                         C. She could draw.
(     ) 4. What day was yesterday?
A. It was Monday.               B. It was Saturday.                         C. It was Friday.
(     ) 5. Where does Jim usually buy things?
A. In the shops.                    B. On the computer.                       C. On the mobile phone.
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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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