单项选择题
A drilled hole is accurately finished to size with a （）
A.center drill B.finish drill C.broach D.reamer
单项选择题 Which of the files listed is tapered on three sides and is used to file acute internal angles?（）
单项选择题 Using a file without a handle may result in （）
单项选择题 Before welding is permitted on a fuel tank, it must be certified or declared （）
