学进去-教育应平等而普惠
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类型:听音,选择正确答案
难度系数:0.65
所属科目:小学英语
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(       ) 1. Is the party in a nature park?
A. Yes, it is.                     B. No, it isn’t.                    C. Yes, they are.
(       ) 2. What are the two ducks doing?
A. They are swimming.        B. They are playing.              C. They are drinking.
(       ) 3. Is the baby kangaroo playing with its mother?
A. Yes, it is.                     B. No, it isn’t.                    C. We don’t know.
(       ) 4. Is the bear eating honey?
A. No, it isn’t.                     B. Yes, it is.                    C. Yes, it does.
(       ) 5. What are the tigers doing?
A. They are walking.               B. They are running.       C. They are sleeping.
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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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