短语词组短语vacuum sugar permeability technology 真空渗糖技术vacuum sugar permeability 真空渗糖absolute permeability of vacuum [电磁]真空绝对导磁率sugar permeability under vacuum 真空渗糖permeability of vacuum [电磁]真空磁导率;真空导磁率;翻译 返回 vacuum permeability