According to I.B.R., the thickness of the boiler shell should not be

1.	According to I.B.R., the thickness of the boiler shell should not be less than
A.	4 mm
B.	5 mm
C.	6 mm
D.	7 mm
Answer» E.

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According to I.B.R., the thickness of the boiler shell should not be less than

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