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backing vacuum造句

"backing vacuum"是什么意思  
造句与例句手机版
  • Slide - back vacuum tube voltmeter
    偏压补偿式电子管伏特计
  • It's difficult to see backing vacuum in a sentence. 用backing vacuum造句挺难的
如何用backing vacuum造句,用backing vacuum造句backing vacuum in a sentence, 用backing vacuum造句和backing vacuum的例句由查查汉语词典提供,版权所有违者必究。