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:0.85
所属科目:小学英语
听录音,根据所听句子,选择正确的答句。(听两遍)
_____) 1. A. Yang Ling is playing the piano now. B. Yang Ling plays the piano every day.
C. Yang Ling is in the classroom.
_____) 2. A. They are making the bed. B. They are in the bedroom. C. They are very happy.
_____) 3. A. He can cook nice food. B. He is a cook. C. He is cooking lunch in the kitchen.
_____) 4. A. Yes, he is helping his parents do housework. B. No, he is doing homework.
C. Yes, he is doing homework.
_____) 5. A. They are helping their parents clean the house. B. They are cleaning the car.
C. They are in the kitchen.
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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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