题型:名词解释 原煤(含硫元素)在氧气中不完全燃烧会生成CO、CO2 和SO2.若测得CO、CO2、和SO2的混合气体中碳元素的质量分数为24%,则其中SO2的质量分数可能是( )A.10%B.30%C.50%D.70% 查看答案
题型:名词解释 When they heard the ___________ news,they got very ___________.A.frustrating, frustratedB.frustrated, frustratedC.frustrated, frustratingD.frustrating, frustrating 查看答案