函数$f\left(x\right)=\sqrt{3}\tan (\frac{x}{2}-\frac{\mathrm{\pi }}{4})$,$x\in R$的最小正周期为（   ）

根据拼音写汉字：

阅读对话，判断正误。

    Pedro: Hi, Li Lei. When do you start class in the morning?

    Li Mei: Usually at 8 o'clock.

   Pedro: It’s early. In Spain we start class at 9 o'clock.

   Li Mei: When do you usually eat dinner, Pedro?

   Pedro: At 9:30 or 10:00 p.m.

   Li Mei: Wow! That's too late. I always go to bed at 9:30. What do you do on the weekend?

   Pedro: I often play football with my friends. Sometimes I go shopping with my mum.

   Li Mei: Sounds interesting. I usually wash my clothes and clean my room at home.