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並前往https://books.google.com.tw/books?id=Fn5ZfLTWK14C&pg=SA7-PA4&lpg=SA7-PA4&dq=rust+sprinkler+timer&source=bl&ots=NoJLPrScMW&sig=ACfU3U1jxseJ9_IuEH3gxiWjZq41huOr3A&hl=zh-TW&sa=X&ved=2ahUKEwjRsf-13671AhWE_aQKHQG_CXsQ6AF6BQitAhAD

General Aircraft Maintenance Manual - 第 7-4 頁 - Google 圖書結果

... shall be maintained for each utility system , such as fire sprinkler system and fixed ... Remove all rust and scale by scraping or wire brushing .

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