用来标识项目工作的特点，或以某种方式对计划活动进行分类来达到能对项目活动进行筛选和排序的一位或多位数值或文字。
One or more numerical or text values that identify characteristics of the work or in some way categorize the schedule activity that allows filtering and ordering of activities within reports.
用来标识项目工作的特点，或以某种方式对计划活动进行分类来达到能对项目活动进行筛选和排序的一位或多位数值或文字。
One or more numerical or text values that identify characteristics of the work or in some way categorize the schedule activity that allows filtering and ordering of activities within reports.
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