论文部分内容阅读
应城市化工厂防水材料分厂生产聚氯乙烯防水油膏已经有六年的历史,但是防水油膏的质量指标(主要是一级品率)还是处于不稳定的状态,这是什么原因呢?合格率统计见表:
It has been six years since the production of PVC waterproof ointment by the Urban Chemical Plant’s waterproof material branch, but the quality index of the waterproof ointment (mainly the primary product rate) is still in an unstable state. What are the reasons? The qualification rate statistics are shown in the table: