学进去-教育应平等而普惠
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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。每个句子读两遍。
(     ) 1. A. When is my birthday?     B. When is your birthday?   C. When is your brother’s birthday?
(     ) 2. A. It’s on 26th October.     B. It’s on 26th September.     C. It’s on 26th December.
(     ) 3. A. It begins at two o’clock in the afternoon.   B. It begins at three o’clock in the afternoon.   C. It begins at four o’clock in the afternoon.
(     ) 4. A. Welcome to my “green” party.       B. Welcome to my “red” party.   C. Welcome to my “orange” party.
(     ) 5. A. That sounds wonderful.       B. That sounds great.     C. That sounds interesting.
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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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