ageing of metal 中文意思是什麼
ageing of metal
解釋
金屬的時效-
Electrical metal sheated tubular heating elements ; 6, 5 mm and 8, 5 mm diameter, determination of ageing and overload characteristics
帶金屬護套的直徑范圍為6 . 5 mm和8 . 5 mm的管狀電
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