The standard specification of a grinding wheel is A-46-M-6-V-21. It me

1.	The standard specification of a grinding wheel is A-46-M-6-V-21. It means a wheel of
A.	Aluminum oxide of mesh size 6
B.	Boron carbide of mesh size 46
C.	Aluminum oxide of mesh size 46
D.	Silicon carbide of mesh size 6
Answer» D. Silicon carbide of mesh size 6

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The standard specification of a grinding wheel is A-46-M-6-V-21. It means a wheel of

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