( )(1)We are a great friend.
![](http://static.xuejinqu.com/qimg/6dc/6dc9116d47cc876b3157cdc26cd8afad.png)
( )(2)I am watching football game.
![](http://static.xuejinqu.com/qimg/337/33752738ecc0281f5dacff69af1b3aaa.png)
( )(3)This is a primary school.
![](http://static.xuejinqu.com/qimg/8bc/8bc8a475653356bae001c657a9cbadb3.png)
( )(4)He is a naughty boy.
![](http://static.xuejinqu.com/qimg/122/1225cb73882deb493a28796360b47247.png)
( )(5)Please write a message in this book.
![](http://static.xuejinqu.com/qimg/40c/40c7eff5df178eb7e968a3f964ca7090.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)