operaticadj.歌剧的；歌剧风格的operan.歌剧n.挪威Opera软件公司的浏览器软件operating contribution业务捐款operating cash balance[经] 营业现金余额operating restrictions使用限制operating availability可能利用率operating pitch radius工作节圆半径operating speeds model运行速度模型operating - question操作题operating system model操作系统模型operating organization作业编组operating pitch circle啮合节圆