学进去-教育应平等而普惠
试题
类型:填空题
难度系数:0.40
所属科目:小学英语
阅读短文,写出句中所缺的单词
The sky usually looks light b________. If you go to the top of the highest mountain, there is less a________ between you and the sun to scatter (分散) the sunlight, the sky would be dark blue. If you take a space s________ high above the earth, there is no air at a________ to scatter the sunlight, the sky would be so dark that it would be black.
Sometimes the sky doesn't l________ blue. A sunrise (日出) and sunset (日落), the light from the s________ is scattered in such a way that you see red, orange, and other colors in the s________.
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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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