counter sinking is the operation of: (a) Enlarging the end of a hole cylindrically (b) Cone-shaped of
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counter sinking is the operation of:
(a) Enlarging the end of a hole cylindrically
(b) Cone-shaped of the enlargement of the end of a hole
(c) Smoothing and squaring the surface around a hole
(d) Sizing and finishing a hole
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