学进去-教育应平等而普惠
试题
类型:填内容补全对话
难度系数:0.65
所属科目:小学英语
A: Is your city very beautiful?
B: Just so-so. Sometimes people 1. rubbish anywhere.
A: That’s bad. Rubbish 2. our city messy.
B: Yes. We should 3. it in the bin.
A: Is the air in your city clean?
A: Not very. Smoke 4. cars and factories makes the air very dirty.
B: That’s true. And we should 5. the bus or go out 6. bike more.
A: We should 7. more trees.
B: Right. Trees help 8. the air clean.
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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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