中国黄色1级片,黄色一级大片免费版,欧美一级免费在线,国产精品ⅴa有声小说,91大神在线免费,99热手机在线观看,99999精品

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.