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,根据对话内容,完成下列各题。(听两遍)
听一段对话,回答第1〜2小题。
(     ) 1. What is on the desk?
A. Letters.       B. Books.       C. Pictures.
(     ) 2. Who wrote these letters?
A. Linda.       B. Jack.       C. Darning.
听一段对话,完成第3〜5小题。
(     ) 3. Bob is ________.
A. writing a letter       B. writing an email to his friends       C. writing an email to Daming
(     ) 4. Bob is going back to ________.
A. the moon       B. the UK       C. Beijing
(     ) 5. Bob will miss his friends from ________.
A. the UK       B. the US       C. the earth
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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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