某地区要建造一条防洪堤，其横断面为等腰梯形（如图），考虑到防洪堤坚固性及石块用料等因素，设计其横断面要求面积为9$\sqrt{3}$平方米，且高度不低于$\sqrt{3}$米．记防洪堤横断面的腰长为x（米），则其腰长x的取值范围是（　　）

根据短文内容，判断句子正误。

    Bangkok is the capital(首都)of Thailand. It is very different from Shenzhen. There are many temples in Bangkok. It is hot all year round, so there are a lot of fruits. The most famous f fruit is durian(榴莲). There are many rivers here, so the market on the water is very famous. You can buy flowers, vegetables, fruits and other things on the boats.

  The best time to visit Thailand is at the end of March or the beginning of April, because it is the most famous festival in Thailand--Water Festival. It is the beginning of their New Year. Before the festival, people clean their house and cook nice food. During the festival, people sing, dance and throw water on each other. They think that water can clean away bad things and bring good luck.

  How in interesting it is!