huà xué shì
chemical formula (e.g. water H2O)
huà xué gōng yè
chemical industry, abbr. to 化工[hua4 gong1]
huà xué xiān wéi
synthetic fiber
chemical fiber
huà xué biàn huà
chemical change
chemical transformation
huà xué xū yǎng liàng
chemical oxygen demand (an environmental indicator)
Zhōng guó shí yóu hé huà xué gōng yè xié huì
China Petrol and Chemical Industry Association CPCIA
shēng wù huà xué zhàn jì
biological-chemical warfare agent
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