Batch distillation under constant reflux can be analyzed?

• A. ‚Äö√Ñ√∂‚àö√ë‚àö¬®dw=dD
• B. dv=-dx
• C. ‚Äö√Ñ√∂‚àö√ë‚àö¬® dy=dZ
• D. dX=dy