permanent ballast 中文意思是什麼
permanent ballast
解釋
船底固定壓載鐵-
Pig iron used as permanent ballast
壓載鐵做為永久性壓艙物的生鐵 -
A ballast intended for permanent installation and provided with a single, threaded nipple meets the intent of the requirements when the nipple is a standard trade size long enough for two locknuts for assembly to a fixture enclosure
整流器為永久性安裝,按照要求提供一個單螺紋接頭,接頭為出口標準長,足夠使兩個防松螺母和附件裝配一起。
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