The main category of responsibility is GA (75%)<br>The main problem categories are poor assembly, Tubes, lines, appearance (more than 80%)<br>The primary problem level is CD (96%)<br>The problem of leakage is outstanding, more than 70% is the quality gate control project.<br>The problem is discrete (there is a certain concentration in the area), TOP30 is less than 20%, and the control is difficult.<br>Affected by space, beat and environment, there are some problems with the detectability of the problem.
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