Through the analysis on main factors that cause low qualification rate at the roof safety meters, corresponding counter measure has been made, resulting in obvious increase at qualification rate.
通过对顶板安全仪器仪表检测合格率低的要因分析，制定出相应的对策，使煤矿顶板安全仪器仪表检测合格率明显提高。
After reconstruction, the qualification rate can increase 3% than the qualification rate of former CAM.
经过改造后，成品合格率提高了3%以上。
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