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真空钎焊
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真空钎焊
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钎焊
释
vacuum brazing
真空钎焊
将装配好钎料的焊件置于真空环境中加热所进行的硬钎焊。
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Qian Xiaodai
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Qianxi Dance
Qianxi Guanyindong Site
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Qianxisi Grotto
Qianxi's Talks about Poetry
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Qianxuesen
Qian Xuesen Library and Museum
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Qianyang human remains
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