您要查找的是不是：
- 虚拟virtual
- 虚拟语气subjunctive
- 虚拟的dummy
- 虚拟机VM
- 虚拟内存virtual memory
- 虚拟光驱virtual drive
- PLCPLC(Programmable Logic Controller)
- 软PLCSoftPLC
- 虚拟化virtualization
- PLC技术PLC technology
- 虚拟现实virtual reality
- 三菱PLCMitsubishi PLC
- 虚拟主机fictitious host computer
- PLC设计PLC design
- 虚拟世界virtual world
- PLC程序PLC program
- PLC教学PLC teaching
- 虚拟经济virtual economy
- 软件PLCSoftPLC
- 虚拟网络virtual network
