第二步：维持一个缺陷预防系统(DPS, defect prevention system)。每一次转换的开始，一块测试板应该运行通过装配工艺的每一步，包括AOI。
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维持一个缺陷预防系统 defect prevention system
有缺陷的转义预防系统 Defective Escape Prevention System
有缺陷逃避预防系统 Defective Escape Prevention System
对健康人自然没什么，佩斯博士强调，但是对于那些免疫系统缺陷或者那些易患肺部疾病的人群——就是老人——最好做好预防工作。
Not for healthy people, insists Dr Pace, but those with a compromised immune system or who are at risk of pulmonary diseases—the elderly, say—may want to take precautions.
这些孩子在1997-2003年之间出生，并且参加了国家出生缺陷预防研究，这项研究从10个州的10个出生缺陷监测系统中提取数据。
The children were born between 1997 and 2003 and were participants in the National Birth Defects Prevention Study, which drew data from 10 birth-defect surveillance systems in 10 states.
通过改进浇注系统，特别是采取在进、排气道芯砂中添加特殊抗脉纹添加剂及在砂芯表面涂刷烧结型涂料等工艺，有效地预防和消除了脉纹缺陷。
Veining defects have been effectively prevented and eliminated by improvement on gating system, especially by special additive to core sand and sinter coating on surface of sand core.
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