单项选择题
A.Bends in the piping B.Slowing the pumping rate C.Pipeline valves D.Backing rings for pipe welds
What normally helps in detecting escaping gas? （）A.Runn...
单项选择题What normally helps in detecting escaping gas? （）
A.Running hand along pipe B.Red flame C.Odor D.Increase the line pressure
What is used to test a tank for oxygen content?（）A.Comb...
单项选择题What is used to test a tank for oxygen content?（）
A.Combustible gas indicator B.Vapor indicator C.Atmosphere analyzer kit D.None of the above
What is the proper first aid for LPG in the eye? （）A.Ap...
单项选择题What is the proper first aid for LPG in the eye? （）
A.Apply an ice pack to the eye B.Keep the eyelid closed C.Flush the eye with plenty of water D.Rub the eye area clean
