要得到真空,必须借助于真空泵对一个空腔进行抽气。常用的真空泵有: 旋片式机械泵和油扩散泵。 Template




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tomski要得到真空,必须借助于真空泵对一个空腔进行抽气。常用的真空泵有: 旋片式机械泵和油扩散泵。 coloring