A ultra-super critical boiler was developed in the US in ……. a) 1950s b) 1970s c) 1960s d) 1940s

A ultra-super critical boiler was developed in the US in …….
a) 1950s
b) 1970s
c) 1960s
d) 1940s
by

1 Answer

Answer :

a) 1950s
by

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