学进去-教育应平等而普惠
试题
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,根据小对话. 选择正确的答案。(听两遍)
(     ) 1. Is the letter from Canada?
A. Yes, it is.          B. No, it isn't.          C. We don't know.
(     ) 2. What did the girl do?
A. She read a book at home.          B. She visited her grandparents.          C. She went swimming.
(     ) 3. Who is going to swim on Sunday?
A. Daming.          B. Lingling.          C. Amy.
(     ) 4. Where do the girl's grandparents go every day?
A. They go to the zoo.          B. They go to the park.          C. They go to the cinema.
(     ) 5. When will Amy leave Beijing?
A. Tomorrow.          B. Next Monday.          C. Next week.
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优质答疑

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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