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,选出句子或对话所缺的内容。
(     ) 1. A: How old is that girl?
B: She is ________ years old.
A. thirteen             B. sixteen        C. seventeen
(     ) 2. A: Do you have ________?
B: No, I don't.
A. any stickers            B. any sweets             C. any grapes
(     ) 3. They are very ________.
A. beautiful            B. cool             C. wonderful
(     ) 4. Can I ________?
A. have a book        B. have a cake             C. have a look
(     ) 5. I have ________.
A. a new robot          B. a red ball                 C. a black car
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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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