亚洲精品成人av久久,伊人久久伊人,91精品美利坚合众国,极品美女色诱视频www,国产欧美123,日韩毛片一区二区三区免费播放,国产午夜久久久久

The Beiyuan graphite crucible is made of special high-purity, high-strength, and high-density graphite material; Excellent technicians; High precision processing equipment can provide customers with high-performance molds for graphite melting crucibles, casting crucibles, graphite oil tanks, pulling tubes, pulling pieces, and pulling rods. The selected specialized material can increase the durability of our graphite crucible products by more than twice compared to ordinary material products, with a longer service life and the ability to withstand high temperatures of 1800 ° C.