virtual PAD虚分组装折设备virtualadj.实质的；【计】虚拟的virtual machine technology虚拟机技术virtual spherical solution虚拟球面解virtual campus walkthrough虚拟校园漫游virtual scanning frequency垂直扫描频率virtual residual bandwidth虚剩余带宽virtual storage management虚拟存储栖理virtual instrument network网络化虚拟仪器virtual reality simulation虚拟现实仿真virtual local area network虚拟局域网virtual digital multimeter虚拟数字万用表