試題詳解

62. Drilling a hole with a diameter of 8mm on a 2mm thick acrylic sheet may cause the acrylic sheet to break. Which of the following methods cannot prevent breakage？
(A) Flatten the tip of the drill bit and then drill
(B) Use a blunter drill bit
(C) Use a stepped drill bit to drill slowly
(D) Use a brand new woodworking bit