单项选择题
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
Safe welding practice requires （）A.checking the area fo...
单项选择题Safe welding practice requires （）
A.checking the area for items that may catch fire B.that a fire watch be posted C.checking for the explosive gases D.all of the above
