久久久亚洲熟妇熟女-久久久影-久久久影院-久久久园产AV-久久久中国热-久久久中精品2025中文

10/主驅動

    Main drive

蝸輪材料選用優(yōu)質(zhì)耐磨合金銅，由精密機床加工，高級技師精細刮削而成，磨損極小，精度高。曲軸，用鉻鋼高頻淬火處理，使用壽命長。擺桿由球磨鑄鐵鑄造而成，強度高，耐磨耐用。

Worm gear material selection of high quality wear resistant alloy copper, from precision  machine tool processing, senior technician fine scraping,wear a very small, high precision. Crankshaft steel with high frequency quenching, long service life. Pendulum polished cast by the cast iron, high strength, wear and durable.