简单理想气体 Delta S 的计算公式正确的是()-|||-A .Delta S=n(C)_(Y) dfrac ({T)_(2)}({T)_(1)}+nRln dfrac ({V)_(2)}({V)_(1)}-|||-B ] Delta S=n(C)_(p) dfrac ({T)_(2)}({T)_(1)}-nRln dfrac ({P)_(2)}({P)_(1)}-|||-C □ Delta S=n(C)_(V) ln dfrac ({T)_(2)}({T)_(1)}-nRln dfrac ({V)_(2)}({V)_(1)}-|||-D .Delta S=nC p, ln dfrac ({T)_(2)}({T)_(1)}+nRln dfrac ({P)_(2)}({P)_(1)}