*/*_The operation of making a cone-shaped enlargement of the end of a

1.	/_The operation of making a cone-shaped enlargement of the end of a hole is known as?
A.	Counter-sinking
B.	Counter-boring
C.	Trepanning
D.	Spot facing
Answer» B. Counter-boring

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*/*_The operation of making a cone-shaped enlargement of the end of a hole is known as?

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/_The operation of making a cone-shaped enlargement of the end of a hole is known as?