单项选择题
What is the function of an air receiver in the compressed air system on a ship? （）
A.Condenses moisture
B.Provides overpressure protection
C.Purifies the air
D.Acts as an accumulator
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单项选择题
What is the female section of a tool joint called? （）
A.Stem
B.Pin
C.Box
D.Stand -
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
