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
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