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

Hello, I'm Sam. I like playing football and taking pictures. Look at these pictures. This is my mother. She's reading the newspaper (报纸). This is my father. He's swimming in the lake. This is my brother, Tom. He's watching TV.

1.Tom is playing with a toy train. (     )
2.Sam's father is swimming. (     )
3.Tom is Sam's brother. (     )
4.Sam's mother is reading a book. (     )
5.Sam likes taking pictures. (     )
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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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