设f（x）=6cos²x﹣$\sqrt{3}$sin2x，

（1）求f（x）的最大值及最小正周期；

（2）若锐角α满足f（α）=3﹣2$\sqrt{3}$，求tan$\frac{4}{5}$α的值．

回答下列问题

（1）氧气可压缩储存于钢瓶中，因为受压时氧气分子间的____减小；

（2）CH₄充分燃烧可用化学方程式表示为　____　；

（3）炒菜时锅里的油不慎着火，可用锅盖盖灭，其灭火原理是____．

下列词语中，没有错别字的一项是(　　)

阅读短文，选择合适的答案。

    I study at Yu Hong Primary School in Guangzhou. I have forty-seven classmates (同学). Twenty-three are boys and twenty-four are girls. Our classroom is a nice one. It's very big. There are four windows and two doors in it. We have a big blackboard and a small one. The big one is for our teachers and the small one is for us. Mr. Li is our Chinese teacher. He is an old man. We don't like him at all. But Miss Chen, our English teacher, is a young woman. She is very nice. We all like her very much. So we like English the best. We often play basketball with Miss Chen.