CIS-1型计算机联锁系统，完成站场显示、操作、语音提示、故障报警、数据输出的是（）。
A、上位机
B、维修机
C、配电系统
D、下位机
参考答案：A
— ______ that he picked up his uncle at the airport?
— It was at 6:00 in the afternoon ______ he got off work. [ ]
A. Was it when; that
B. When was it; that
C. Was it when ; when
D. When was it; when
编制项目管理实施规划的依据中，最主要的是( )。
A．项目管理规划大纲 B．项目条件和环境分析资料C．工程合同及相关文件 D．同类项目的相关资料
when ; when