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英语翻译When a gasket,seal or O-ring is not included,the joint s

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英语翻译
When a gasket,seal or O-ring is not included,the joint shall be of tight tolerance with sufficient width contact so as to provide ingress protection per the dust exclusion test with the joint at its worse case design value.
未安装垫圈或密封圈时,接头的紧密度容限应留足够宽度以供接触,为排尘测试提供出口保护,测试接头的结构参数调整到最低限度.