学进去-教育应平等而普惠
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类型:单词填空
难度系数:0.85
所属科目:初中英语

   At 7 am, we got on the state-of-the-art Fuxing Hao train at Shanghai Railway Station. We stored our 1. (背包) and found our seats. Unlike other trains which start with a shake and much 2. (噪音), this train felt so smooth that if you were not looking out of windows, you could 3. (几乎不) tell we were moving. Yet, within minutes, we were passing over the rails at speeds of more than 350 kilometers an hour.

Soon, the towns of 4. (东部的) China were rushing by. I saw my wife smiling and 5. (指向) to a coin she had balanced on the table. She took another coin and balanced it next to the first, and then another, until she had a 6. (行) of coins. They stood there on the table for more than 20 minutes before one finally fell over.

After that, we 7. (两个都) went back to reading and enjoying the beauty outside. We felt quite 8. (放松的). Then, before we knew it, we heard the announcement that we were arriving in Beijing. For 1,318 kilometers, we 9. (花费) only 4 hours and 38 minutes. Thanks to high speed trains, we can travel in China much more conveniently. No 10. (疑惑), they will also bring the people of the country closer together, and in time bring about deep social changes, the full nature of which no one can fully guess.

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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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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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