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
阅读短文,判断正(T)误(F)。
When you walk in the country, you should follow these rules:
* To protect the trees, don’t start fires (点火) in the forest.
* Don’t throw rubbish here and there. When you leave, take away waste paper and bottles.
* Keep the river clean. The water here is used for drinking.
* Please protect animals and plants. Don’t shoot (射杀) birds. Don’t pick flowers.
1.We should follow the rules to protect the environment. (     )
2.We can smoke in the forest. (     )
3.We should leave waste paper and bottles on the ground. (     )
4.The river water in the country is used for drinking. (     )
5.We can pick flowers in the country. (     )
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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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