B class pipe is heavier.
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The main difference is the thickness of the pipe Compare to A Class pipe B Class pipe thickness is more.Like that Compare to B class pipe C Class pipe thickness is more.
150nb
The class case exception is thrown when an object A of class type B is cast to a class type C where C is neither B nor its subclass.
single level inheritance eg ( class B extends Class A) Multilevel inheritance eg( class C extends class B and class B extends class A) multiple inheritance Class C inherits Class A features as well as Class B featues.This type of inheritance is not allowed in JAVA.
MS ESW = mild steel electric resistance welding c class = smaller size