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並前往https://books.google.com.tw/books?id=ABdbihRzcdkC&pg=RA2-PA13&lpg=RA2-PA13&dq=VAT+gate+valve&source=bl&ots=cs9bGIzqSL&sig=ACfU3U1LO7d0i03aIEQ48k69BX4Kc3Kqsg&hl=zh-TW&sa=X&ved=2ahUKEwi_9Z_BiNb_AhXYDd4KHS5yAHcQ6AF6BQimAhAD

Circular - 第 276-307 期 - 第 13 頁 - Google 圖書結果

A strainer is then inserted in the gate valve from the inside , and the valve is opened full width . When a sloping bottom has not been built in the vat the ...

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