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
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相关考题
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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 -
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 -
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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
