单项选择题
A.center drill B.finish drill C.broach D.reamer
Which of the files listed is tapered on three sides and...
单项选择题Which of the files listed is tapered on three sides and is used to file acute internal angles?（）
A.Mill B.Round C.Square D.Triangular
Using a file without a handle may result in （）A.your wo...
单项选择题Using a file without a handle may result in （）
A.your work becoming rounded B.injury to your hand C.overheating of the file D.pinning
Before welding is permitted on a fuel tank, it must be ...
单项选择题Before welding is permitted on a fuel tank, it must be certified or declared （）
A.safe for becoming rounded B.safe for hot work C.not safe for personnel D.not safe for hot work
