多车型车辆路径问题
Multi-types vehicle routine problem
加强型小型化可热插拔光收发模块
SFP+ optical transceiver module
汽车小型化
miniaturization of vehicle
物流小车车架
logistics light trolley′ frame
小型小功率直流电磁继电器
miniature low power electromagnetic DC relay
小型型钢
light shape
small-sized section steel
small section
Small-section
light section
merchant bar