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				| 1. | How is the length of the surface calculated in case of countercurrent settling? | 
| A. | tL<sub>p</sub>=wV<sub> </sub>/ v cos | 
| B. | tL<sub>p</sub>=(V<sub> </sub> V sin )/ v cos | 
| C. | tL<sub>p</sub>=w(V<sub> </sub> V sin ) | 
| D. | tL<sub>p</sub>=w(V<sub> </sub> V sin )/ v cos | 
| Answer» E. | |