数控技术是一种自动控制技术。（）
参考答案：对
How long does it take to the station?
It's about _____ walk. [ ]
A. six minutes's
B. six-minutes
C. six minutes'
D. six minutes
PLC-5/40E的CPU模块通讯口——通道1A为（）通讯口
A、RS-232
B、以太网CD、H+
D、I/O适配器、I/O检测器或
D、H+
