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單項(xiàng)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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單項(xiàng)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

單項(xiàng)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

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