在一个已知无(或有序）序队列中找出与给定关键字相同的数的具体位置。原理是让关键字与队列中的数从第一个开始逐个比较，直到找出与给定关键字相同的数为止。-In a known free (or ordered) sequence in the queue to find the given key number of the specific location of the same. Principle is to allow the number of keywords in the queue one by one starting from the first comparison, until you find the same with a given number of keywords so far.