单项选择题

What will NOT increase friction of a liquid flowing in a pipe and cause a loss of suction head?（）.

A.Bends in the piping
B.Slowing the pumping rate
C.Pipeline valves
D.Backing rings for pipe welds

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单项选择题

A.Running hand along pipe
B.Red flame
C.Odor
D.Increase the line pressure

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