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。(听两遍)
(     ) 1. A. How much is the cola?       B. How much are the colas?       C. How many colas are there?
(     ) 2. A. What do you want to eat?       B. What do you want to drink?       C. What do you want to do?
(     ) 3. A. I want chicken and rice.       B. I want chicken and noodles.     C. I want fish and noodles.
(     ) 4. A. It's twenty dollars and twenty-five cents.       B. It's thirty dollars and twenty-five cents.     C. It's twenty dollars and twenty-four cents.
(     ) 5. A. That's a hot dog.   B. What's a hot dog?       C. Is it a hot dog?
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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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