学进去-教育应平等而普惠
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难度系数:0.65
所属科目:小学英语
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(     ) 1. What’s the date today?
A. Tuesday.       B. October 1st.       C. September 30th.
(     ) 2. What color are the flags?
A. Green.       B. Red.       C. Yellow.
(     ) 3. What holiday is coming?
A. Teachers’ Day.        B. National Day.       C. New Year’s Day.
(     ) 4. Where will Lingling go?
A. Tian’anmen Square.       B. Cinema.        C. Museum.
(     ) 5. What will Mike do?
A. Go to see flowers.       B. Go to school.       C. Go to the zoo.
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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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