【单选题】【消耗次数：1】
下面的系统中，（）是实时系统。
①
办公室自动化系统
②
航空订票系统
③
计算机辅助设计系统
④
计算机激光排版系统
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相关题目
【单选题】
通过计算机网络，将计算机辅助设计、计算机辅助规划以及计算机辅助制造，统一连接成一个大系统称为（ ）
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