单项选择题

With reference to a radial piston pump, which one of the following statements is false?（）

A.Surrounding the fixed shaft is a hollow shaft
B.This hollow shaft carries radial bores
C.Each bore is fitted with a well-lapped plunger
D.There are always even numbers of bores

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船舶辅助机械

With reference to a radial piston pump, which one of the following statements is false?（）