class of hardness 中文意思是什麼
class of hardness
解釋
硬度分類-
The base has features of high strength and hardness, owing to high quality material of first - class pig iron and casting of interal body. the main duriving shafts are durable in use through high cycle heat treatment of surface
本機器的機座採用于等生鐵鑄造,強度高、剛性好、主要傳動軸類均經表面高周波熱處理,經久耐用。
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