单选题When installed for bilge pumping or ballast duty, centrifugal pumps require a （） to remove air from the suction pipe.Aair chamberBhead lankCprimerDprime mover
单选题
When installed for bilge pumping or ballast duty, centrifugal pumps require a （） to remove air from the suction pipe.
A
air chamber
B
head lank
C
primer
D
prime mover
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