化 工

chemical industry (abbr. for 化学工业[huà xué gōng yè])
chemical engineering (abbr. for 化学工程[huà xué gōng chéng])

出现在

化工厂huà gōng chǎngchemical factory; chemical plant 中国石油化工股份有限公司zhōng guó shí yóu huà gōng gǔ fèn yǒu xiàn gōng sīChina Petroleum and Chemical Corporation, Sinopec