그중 도면 b는 무엇을 의미하나요?
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도면에서 b는 무엇을 의미하나요?
홈페이지의 이미지에 설명이 있는지 확인해 보세요. 파이프에 경사가 있는지 알 수 있나요?
혹시 a c d라는 의미도 있나요?
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