A.
![](http://static.xuejinqu.com/qimg/598/598c9a0a4c472204e08dd584022b0309.png)
![](http://static.xuejinqu.com/qimg/de6/de69ffdfbb18c1f08bd67b38b316fec6.png)
![](http://static.xuejinqu.com/qimg/80b/80b884eaa3e956537cc9f37abd8b58e3.png)
D.
![](http://static.xuejinqu.com/qimg/b3b/b3bacf7d8a8ac6fe51bd401a2ed5c94d.png)
![](http://static.xuejinqu.com/qimg/430/43066fa06ac81f1957324e1e0046d8f7.png)
1.Point to the desk.
2.Stand up!
3.Hello, I’m a bird.
4.Sit down!
5.Point to the door.
![](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)