学进去-教育应平等而普惠
试题
类型:听音,选择听到的内容
难度系数:0.85
所属科目:小学英语
听录音,选出你所听到的句子。(听两遍)
(     ) 1. A. I'm writing an email to my friends.       
B. I'm writing a letter to my friends.
C. I'm writing a letter to my family.
(     ) 2. A. There are about forty letters here.       
B. There are about fifty letters here.
C. There are about fourteen letters here.
(     ) 3. A. This one is for Amy.       B. That one is for Amy.       C. This one is for Lily.
(     ) 4. A. What a lot of good wishes!       B. What lots of good wishes!       C. Best wishes to you!
(     ) 5. A. Good luck for the future!       B. Wishing you happiness every day!       C. Best wishes to you!
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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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