学进去-教育应平等而普惠
试题
类型:任务型阅读
难度系数:0.65
所属科目:小学英语

Wang Dan was busy yesterday. In the morning, she went to the supermarket with her friends. They bought some vegetables and fruit. Then she helped her mother cook lunch. In the afternoon, she helped her mother wash the clothes and water flowers. After dinner, she did her homework. She went to bed at nine.

1.Wang Dan is busy today. (       )
2.They bought some vegetables with her mother. (       )
3.Wang Dan helped her mother clean the house. (       )
4.After dinner, she did her homework. (       )
5.She went to bed at ten. (       )
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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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