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vacuum heating
archit. 真空供暖
met. 真空加热
refrig. 真空采暖
tech. 真空供爱; 真空采爱
vacuum -melted heat
met. 真空熔炼钢液
vacuum heating: 18 phrases in 6 subjects
Metallurgy4
Plastics1
Refrigeration2
Solar power2
Space1
Technology8