What will NOT increase friction of a liquid flowing in a pipe and cause a loss of suction head?（）.<br>A:Bends in the piping<br>B:Slowing the pumping rate<br>C:Pipeline valves<br>D:Backing rings for pipe welds

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

出自：海船船员证

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