"主要作业表" can be translated as "Main Task List" or "Primary Operation Schedule" in English, depending on the specific context.
If it refers to a list of primary tasks or assignments, "Main Task List" would be more appropriate.
If it pertains to a schedule or timetable of key operations or activities, "Primary Operation Schedule" could be a fitting translation.
In most general cases, "Main Task List" is likely to be the most straightforward and commonly used translation.