1)preoperational,運行前的2)preoperative,操作前的，運行前的3)preoperational test,運行前的試驗，運行前試驗4)prophase operation,前期運行5)Commissioning PG,(試運行前的)開通調測6)The act or state of preceding;precedence.,先行向前運動的行為或狀態(tài);先行
用法和例句
,presented its loading and sulfurization and summarizes the experiences of its prophase operation.
