halocarbons造句
Anyofseveralhalocarbonsusedasfire-extinguishingagents.AtmospherichistoriesofhalocarbonsfromanalysisofAntarcticfirnair:methylbromide,methylchloride,chloroform,anddichloromethane....
Anyofseveralhalocarbonsusedasfire-extinguishingagents.AtmospherichistoriesofhalocarbonsfromanalysisofAntarcticfirnair:methylbromide,methylchloride,chloroform,anddichloromethane....