The thermal efficiency of a Watt‚Äö√Ñ√∂‚àö√ë‚àö¬•s Beam Engine is about?

The thermal efficiency of a Watt‚Äö√Ñ√∂‚àö√ë‚àö�

1.	The thermal efficiency of a Watt‚Äö√Ñ√∂‚àö√ë‚àö¬•s Beam Engine is about?
A.	50%
B.	100%
C.	5%
D.	2%
Answer» E.