(1)What’s the time ?
It’s twelve o’clock.
(2)What’s the time ?
It’s twelve thirty.
(3)What’s the time ?
It’s nine fifteen.
(4)What’s the time ?
It’s nine forty-five.
(1)
![](http://static.xuejinqu.com/qimg/b25/b2536a94a5720f5c0ec5141c7efe0a73.png)
![](http://static.xuejinqu.com/qimg/794/7940b3c237fabee85b68e6fc2cebe86a.png)
![](http://static.xuejinqu.com/qimg/0fc/0fce93c69b5004b9230928416dae185d.png)
![](http://static.xuejinqu.com/qimg/b98/b9857c13df1881e9a2d2924ce68bb411.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)