The number of feedwater heaters required in a Watt‚Äö√Ñ√∂‚àö√ë‚àö¬•s Beam Engine is?$

The number of feedwater heaters required in a Watt‚Äö√Ñ√∂�

1.	The number of feedwater heaters required in a Watt‚Äö√Ñ√∂‚àö√ë‚àö¬•s Beam Engine is?$
A.	0
B.	4
C.	6
D.	8
Answer» B. 4