1. It's one o'clock.
![](http://static.xuejinqu.com/qimg/f02/f029e1d10ce958d05f511a6b499803c8.png)
2. It's eight o'clock.
![](http://static.xuejinqu.com/qimg/3a2/3a23d653a5228ed4e5758558860b72ee.png)
3. It's five o'clock.
![](http://static.xuejinqu.com/qimg/3a2/3a23d653a5228ed4e5758558860b72ee.png)
4. It's four o'clock.
![](http://static.xuejinqu.com/qimg/0e6/0e6ac8bdeda1e62cc9ff48ea3005b7bc.png)
5. It's nine o'clock.
![](http://static.xuejinqu.com/qimg/393/393ceb4b753d31e6031f47d1d5fa842b.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)