关于合金的叙述，不正确的是（　　）

依次填入下面一段文字横线处的语句，衔接最恰当的一组是（3分）
红外光在生活中不为人所知，          ，          。         ，
           ，           ，           。用红外拍摄景象就要恢复被过滤的红外光，所以需要把可见光进行过滤阻隔。
①因为它不是肉眼的可见光          
②平时拍摄时
③就像电视遥控板发出的光芒常常被人忽略
④其功效是阻隔红外光成像
⑤就在数码相机CCD前加了一块低通滤镜
⑥为了让相机拍出的画面还原到与人肉眼看到的景象一致

   It's Charlie's birthday today, but he isn't feeling happy. No one wishes him a happy birthday. Mother says nothing about his birthday. She just tells Charlie to play outside. At lunchtime, his mother calls, "Come in for lunch, Charlie!" Charlie slowly walks into his house. But the living room looks different. Charlie sees a big "Happy Birthday"banner(横幅). Then, he sees a birthday cake, balloons, presents, and all of his friends. "Happy birthday!" everyone shouts. Charlie’s face lights up. He is happy and surprised(吃惊). No one forgets his birthday after all!

用铁片与稀硫酸反应制取氢气时，下列措施不能使氢气生成速率加大的是

已知函数f（x）= $\sqrt{3}\sin \omega x\cdot \cos \omega x+{\cos }^2\omega x-\frac{1}{2}$ ，（ω＞0），其最小正周期为 $\frac{\pi }{2}$ ．