国产精品片211在线观看,十九岁日本免费完整版观看,久久久久久免费精品永久,国产精品一区欧美日韩制服,免费观看激色视频网站性色,无遮挡十八禁在线视频国产,精品国产一级aa久久毛片,97超碰人人在线,久久中文亚洲国产,国产欧美综合精品一区二区

Tianyuan is lost wax precision casting co. We have automatic production line and completed texting method, we also supply all Kinds machining for our casting parts. The inspection instruments including the SPECTRO spectral analysis, X-ray crack detection, magnetic particle detection, ultrasonic flaw detection and 3D size examine etc. The final products have high quality standard. The casting surface roughness is Ra1.6—6.3.