Anyone who has had a long-term disease knows that recovering at home can be lonely. This can be____(especial) true of children. They may feel ____ (leave) out. Now, these children may have a high-tech friend to help fed less alone. A small robot may help children who are recovering from long-term illnesses. The robot like human beings takes their place at school. And their school friends must help carry the robot between classes and place the robot on their desks.

    Through the robot, a child can hear his or her teachers and friends. He or she can also attend classes from wherever they are recovering—whether at home____from a hospital bed. Dolva, one of the scientists who ____(be) concentrating on developing the robot, explains____the robot AVI works. She says from home, the child uses a tablet or phone to start the robot,____ (use) the same device, he or she can control the robot's movements. Inside the robots there is a small computer linked____a 4G network. The robot is ____(equip) with speakers, microphones and cameras,____makes communicating____(easy). So it's the eyes and the cars and the voices at school. Hopefully AVI will help some children feel less lonely while they are absent from class.

关于函数f（x）=4sin（2x+$\frac{\mathrm{\pi }}{3}$），（x∈R）有下列命题：

（1）y=f（x）是以2π为最小正周期的周期函数；

（2）y=f（x）可改写为y=4cos（2x﹣$\frac{\mathrm{\pi }}{6}$）；

（3）y=f（x）的图象关于（﹣$\frac{\mathrm{\pi }}{6}$，0）对称；

（4）y=f（x）的图象关于直线x=﹣$\frac{\mathrm{\pi }}{6}$对称；

其中真命题的序号为____

  取值范围是（  ）

下列调查中，适宜采用全面调查方式的是（    ）