关于塔设备的翻译? 请问对与 塔设备 ,这句话应该怎么翻译? for trays 1 to 6,two valve weights shall be used.Approximately 50% shall be light weight valves.Each row of valves shall be either all light valves or all heavy valves.Light valves shall be located in center two rows.All other rows shall be heavy valves. 谢谢您的帮助。查看更多3个回答 . 4人已关注