学进去-教育应平等而普惠
试题
类型:书信写作
难度系数:0.15
所属科目:高中英语
Directions: Write an English composition in 120-150 words according to the instructions given below in Chinese.
最近上海的某些餐馆和面包房采取了一项新的举措:在微信小程序上以盲盒的形式降价销售当天卖剩的食物,购买者能在小程序上看到商家信息、价格和取货时间。英语报“YOUR VOICE”专栏欢迎读者来信,就这一做法展开讨论。假定你是高三学生李华,请给专栏编辑写信,表达看法,说明理由。
(食物盲盒: mystery boxes of randomly packed leftover foods )
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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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