单选题 The line of computing jobs waiting to be run on a computer system might be a ______. The jobs are serviced in the order of their arrival, that is, the first in is the first out.
【正确答案】 A
【答案解析】[解析] 计算机系统上等待运行的计算作业队伍可以排成一个队列，按到达的先后顺序进行处理，即先进先出。