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.

A．queue

B．stack

C．array

D．record

内存条的存取速度（存储周期）是指两次独立的存取操作之间所需的最短时间，又称为存储周期，半导体存储器的存取周期时间单位一般是毫秒级。