题目气相反应2A + B → 3P + S进料时无惰性气体,A与B以2∶1摩尔比进料,则膨胀因子=_______.( )A. –1B. –1/2C. 1/2D. 1气相反应2A + B → 3P + S进料时无惰性气体,A与B以2∶1摩尔比进料,则膨胀因子=_______.( )A. –1B. –1/2C. 1/2D. 1题目解答答案C. 1/2