11.真空保护层(guard vacuum) 护围在真空容器外面的真空层。
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guard against error vacuum 保护真空装置
guard against error vacuum manifold 辅助真空管道
When a pump is used to provide a vacuum, we consider it even more important to guard against leakage.
当泵被用来抽取真空时,我们认为尤为重要的是防止漏气。
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