单项选择题

What is the female section of a tool joint called? （）

A.Stem
B.Pin
C.Box
D.Stand

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单项选择题
What is the best instrument for establishing a safe working area before welding in a confined space? （）

A.An oxygen indicator
B.A combustible gas indicator
C.A combination combustible gas and oxygen indicator
D.A flame safety lamp
单项选择题
What is the BEST conductor of electricity?（）

A.Carbon dioxide
B.Distilled water
C.Fresh water
D.Salt water
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