天天天干干_天天操天天草_午夜精品成人福利_中国做受xxxxxaaaa_蜜臀av免费一区二区三区久久乐_国产欧美一区二区三区免费看

Hudong Shipbuilding Sand Blasting Room

In 2001, Guangcheng designed and manufactured the largest sandblasting room project in China, which is also the first modern coating room in China. The double-cylinder four-gun sandblasting machine developed by Guangcheng was applied for the first time.