已知函数f（x）=$\sqrt{3}$cos2x+2sinxcosx，x∈R．

（1）求函数f（x）的最小正周期；

（2）求函数f（x）在区间0，$\frac{\mathrm{\pi }}{4}$上的值域．

下列物态变化现象中属于液化的是（  ）

简要分析题民
材料一：知人者智，自知者明。——老子
材料二：人须知耻，方能过而改。——朱熹
材料三：世界上最宽阔的是海洋，比海洋更宽阔的是天空，比天空更宽阔的是人的胸怀。
材料四：在我国，没有特殊的公民，也没有特殊的权利。任何人不论职位高低，功劳大小，只要违背法律，就要承担法律责任。 

   The first telephone cards, produced in 1976, were Italian. Five years later the first British card appeared, and now you can buy cards in more than a hundred countries. People usually start collecting cards because they are small and light and you do not need much space for them. It is also a cheap hobby for beginners, although for some people it becomes a serious business. In Paris, for example, there is a market where you can only buy telephone cards, and some cards cost up to ￡4,000.The first Japanese card has a value of about ￡28,000. Most people only see cards with prices like these in their collectors' magazine.