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

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单项选择题

A.Combustible gas indicator
B.Vapor indicator
C.Atmosphere analyzer kit
D.None of the above

单项选择题

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

单项选择题

A.vaporizes
B.attacks caustically
C.rises
D.attacks corrosively