operaria职虫(膜翅目)operan.歌剧n.挪威Opera软件公司的浏览器软件operating authorization经营许可operating system theory操作系统理论operating system kernel操作系统核心,操椎统核心operatinng availability可能利用率operating control device运行控制装置operating leverage ratio经营杠杆系数operating vehicle-days运营车日operating efffectiveness作战效能operating recommendation操作建议operating instrument set手术包