单项选择题
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
Upon release to the atmosphere，LFG readily（）.A.vaporize...
单项选择题Upon release to the atmosphere，LFG readily（）.
A.vaporizes B.attacks caustically C.rises D.attacks corrosively
