A grinding wheel is said to be glazed if

1.	A grinding wheel is said to be glazed if
A.	grains have become blunt, but do not fall out
B.	gap between the grains is filled by dwarf
C.	it becomes black due to burning
D.	part of the wheel is chipped off
Answer» B. gap between the grains is filled by dwarf

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A grinding wheel is said to be glazed if

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