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는 왜 같은 종류의 펌프를 사용하지 않고 서로 다른 종류의 펌프를 사용하는 것이 좋다고 하는 것인가?
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는 여러 펌프를 직렬로 연결하여 진공을 높히는 이유는 무엇인가?
첫 번째 질문은 서로 다른 종류의 진공 펌프가 아닌 서로 다른 형식의 펌프인가?
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