Operating Room手术室;操作室 Oregon (US postal abbreviation)俄勒冈州(美国邮政的缩写) Operational Review操作回顾 Operations Research运筹学,手术研究,手术探查 Originator / Recipient汇款/接收 Owner's Risk损失由货主承担(海运业用语) Operational Research运筹学 Overload Relay过载继电器 Official Receipt正式收据 Oregon俄勒冈 Occupancy Rate居住率 Order Register指令寄存器 Out of Range在射程之外 Operations Requirement操作[运行]要求 Octane Requirements辛烷值要求