学进去-教育应平等而普惠
试题
类型:单词拼写
难度系数:0.65
所属科目:小学英语
根据所给首字母填入适当的单词
1. A d________helps people to take care of their teeth.   
2. An a________travels in a spacecraft.   
3. A n________helps make sick people better.   
4. A f________helps people to put out fires.   
5. A b________makes bread, cakes, etc.   
6. An e________designs the roads, bridges, machines.   
7. A p________brings letters and parcels to people.   
8. A r________writes or tells people about news or stories in newspapers or on television.
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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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