수력 조절밸브와 버터플라이 밸브에 관한 영상
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동영상은 인터넷에 있으니 바로 클릭해 보세요: http://www.cncryo.com/?p=1110 만들어진 것도 꽤 괜찮으니, 초보자들은 참고하시기 바랍니다.
글쓴이님께 감사합니다, 고마워요!수고하셨습니다, 정말 감사합니다!
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