1. —Was it sunny in London yesterday?
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![](http://static.xuejinqu.com/qimg/d81/d816d419005198959d5e6f442164224b.png)
2. —Is it windy in Beijing?
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![](http://static.xuejinqu.com/qimg/3a9/3a9ec46547dfcc5e3682d9142e6bd8fa.png)
3. —Were you at the zoo yesterday?
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![](http://static.xuejinqu.com/qimg/02d/02ddc8b7088232b10e62c0d5d42ba9a6.png)
4. —Were you at the cinema yesterday?
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![](http://static.xuejinqu.com/qimg/de1/de1bf35b63858e0b6dc7a1f541a6d151.png)
![](http://static.xuejinqu.com/images/y-prise.png)
同类型试题
![](http://static.xuejinqu.com/images/medal.png)
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
![](http://static.xuejinqu.com/images/avatar.png)
![](http://static.xuejinqu.com/images/avatar.png)
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
![](http://static.xuejinqu.com/images/avatar.png)
![](http://static.xuejinqu.com/images/avatar.png)