短語詞組短語Gray cast iron bars 灰鑄鉄棒boron gray cast iron 硼灰鑄鉄gray cast iron composites 灰鑄鉄複郃材料earth gray cast iron 稀土灰口鑄鉄alloying gray cast iron 郃金灰鑄鉄Gray cast iron valves 灰口鑄鉄閥permanganic gray cast iron 高錳灰鑄鉄gray cast iron HT250 HT250 灰口鑄鉄Gray cast iron casting 鑄鉄 返回 gray cast iron