计算方法二:换算因数法 aabb=cctlD n (a)=n(B) c(A)·(A)= bC(B)·V(B)3 计算方法二: 换算因数法 a b c d A B C D + = + (A) (B) (A) (A) (B) (B) a c V a n n c V b b  =  =