Pick up the incorrect statement from the following:
A.	The gross section of the web of rolled I-beams is the depth of the beam multiplied by the web thickness
B.	The gross section of the web of channels is the depth of the web multiplied by its thickness
C.	The gross section of the web of plate girders is the depth of the web plate multiplied by its thinkness
D.	None of these.
Answer:B
Pick up the incorrect statement from the following:
A.	The gross section of the web of rolled I-beams is the depth of the beam multiplied by the web thickness B.	The gross section of the web of channels is the depth of the web multiplied by its thickness C.	The gross section of the web of plate girders is the depth of the web plate multiplied by its thinkness D.	None of these.