backing vacuum

backing vacuum是什么意思、backing vacuum怎么读
【化】 前级真空

backing vacuum汉语翻译

【化】 前级真空
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welding with flux backing
welding with backing
welding flux backing
welding backing
temporary backing
silicon backing wafer
polyester backing
piggybacking
permanent backing
floating head backing device
busy-backing
backing-out
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