There is no systematic difference in membership between the group of mechanics who do first-time jobs and the group of those who do rework jobs.
在第一次工作的技工组和返工的技工组之间没有系统性差异。
There is no systematic difference in membership between the group of mechanics who do first-time jobs and the group of those who do rework jobs.
在第一次工作的技工组和返工的技工组之间没有系统性差异。
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