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

Sam has got lots of stamps. Collecting stamps is his hobby. These are some stamps from Canada. They are famous men and women. And he has got some Chinese stamps, too. And some stamps are from Daming’s letters.

1.Collecting dolls is Sam’s hobby.   (           )
2.He’s got some Canadian stamps. (           )
3.He hasn’t got any Chinese stamps. (           )
4.Daming is a famous man. (           )
5.Some stamps are from Daming’s letters. (           )
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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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