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根据需要，炉内气氛可以是普通气氛、保护气氛或真空。
According to need, furnace atmosphere, protective atmosphere or vacuum can be a normal atmosphere.
youdao
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根据需要，炉内气氛可以是普通气氛、保护气氛或真空。
According to need, furnace atmosphere, protective atmosphere or vacuum can be a normal atmosphere.
youdao