Boiler tube size is specified by its thickness and _____________________ diameter ?

Boiler tube size is specified by its thickness and ___________________

1.	Boiler tube size is specified by its thickness and _____________________ diameter ?
A.	Outside
B.	Inside
C.	Mean
D.	None of these
Answer» B. Inside

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Boiler tube size is specified by its thickness and _____________________ diameter ?

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