1)preoperational,运行前的2)preoperative,操作前的，运行前的3)preoperational test,运行前的试验，运行前试验4)prophase operation,前期运行5)Commissioning PG,(试运行前的)开通调测6)The act or state of preceding;precedence.,先行向前运动的行为或状态;先行
用法例句
,presented its loading and sulfurization and summarizes the experiences of its prophase operation.
