27.已知飽和液體(乾度 \( x=0 \))之比重 \( S_f \)，飽和汽體(乾度 \( x=1.0 \))之比重 \( S_g \)，假設今有飽和液汽體共存的比重 \( S \)，則其品質 \( x \) 等於？

(A) \( x = \frac{S - S_f}{S_g - S_f} \)

(B) \( x = \frac{S + S_f}{S_g + S_f} \)

(C) \( x = \frac{1/S - 1/S_f}{1/S_g - 1/S_f} \)

(D) \( x = \frac{S + S_f}{[(S_g + S_f)/(S_g \times S_f)]} \)

(E) \( x = \frac{S - S_f}{[(S_g + S_f)/(S_g \times S_f)]} \)

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