單項選擇題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


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1.單項選擇題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

2.單項選擇題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

3.單項選擇題Which lubricating oil additive is used in diesel engines to reduce the tendency for sludge and varnish to form on the engine parts?（）

A.Flash point improvers
B.Pour point improvers
C.Inhibitors
D.Foam suppressors

4.單項選擇題Which of the following characteristic of lube oil helps to reduce the amount of deposits in the piston ring belt during the combustion process in a diesel engine?（）

A.Low viscosity index
B.Low carbon forming tendencies
C.High film strength
D.High non-corrosive qualities

5.單項選擇題A diesel engine exposed to widely varying ambient temperatures should use to a lubricating oil with （）

A.a high viscosity index
B.a low viscosity index
C.neutralize acids
D.resist oxidation at high temperatures