Hello, I am Dingding from Zhangjiajie. Yesterday I was very excited. My mother bought me a computer. It was my birthday present. I downloaded(下载) some music from the Internet. And I emailed my friend Tom in Canada. Tomorrow I will go to Changsha to visit my uncle. Now I am checking the train timetable on the computer. I like my computer. It helps me a lot.
1.Dingding is from Zhangjiajie.2.Yesterday Dingding was very excited.
3.Dingding’ father bought him a computer.
4.Dingding’ friend Tim is in Australia.
5.Dingding is checking the train timetable on the computer.
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同类型试题
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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
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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
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