열교환기 모델 문의드립니다
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선생님들께 여쭤보고 싶은데, 열교환기 형식인 BJ21U에서 21이라는 숫자는 무슨 의미인가요?여러분, 감사합니다
포럼 2009년 4월 22일의 게시물을 살펴볼 수 있습니다
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