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
单项选择题 What is the female section of a tool joint called? （）
单项选择题 What is the best instrument for establishing a safe working area before welding in a confined space? （）
单项选择题 What is the BEST conductor of electricity?（）
