The annular space between the outer tube and inner tube is evacuated to virtually eliminate heat loss by conduction and convection.

 
  • 而介于外管与内管的真空环状部分是用来减少热散失的。
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  • 深远海浮式风电平台 - deep-sea floating wind power platform
  • 京雄高速公路 - Beijing-Xiongan expressway
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