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並前往https://books.google.com.tw/books?id=yrwkAQAAIAAJ&pg=PA301&lpg=PA301&dq=pump+jack+rust&source=bl&ots=BjQ05Qs7ea&sig=ACfU3U2Jyvb5jpKuX_iuP3SgFJJGNMliCg&hl=zh-TW&sa=X&ved=2ahUKEwjnqqSigfT0AhUKsaQKHdCdBBkQ6AF6BQjFAhAD

NAVDOCKS. - 第 301 頁 - Google 圖書結果

Annually , the pump jack should be inspected for wear . ... ( 5 ) Paint exterior surfaces ; paint interior surfaces ( subject to rust ) with a suitable ...

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