6.对于理想气体化学反应 =-dD(g)-e(g)-... +gG(g)+rR(g)+... , 若标-|||-准压力分别取为p甲和p^2,相应的标准平衡常数为 _(1) 和K2,则 (({K)_(2)}^theta /({K)_(1)}^theta ) 等于-|||-() 。-|||-A. (({P)_(1)}^theta /({P)_(2)}^theta )dfrac ({S)_({V)_(B)}({B)_(B)}^(V_{B)}; B. ((P)_(2)/({P)_(1)}^theta )dfrac (5{V)_(1)(V)_(0)}(B)(V)_(B);-|||-C. _(1)^theta /({P)_(2)}^theta ; D. ({P)_(2)}^theta /({P)_(1)}^theta