单项选择题
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
单项选择题 With reference to an axial piston pump, which one of the following statements is true?（）
单项选择题 With reference to a two ram actuating mechanism, which one of the following statement is false?（）
单项选择题 As the air passes through the charge air cooler, its temperature may be reduced and moisture condensed, with the condensate in danger of being carried into the engineSo a water separator should be mounted beneath the bottom part of the engine inlet manifoldA water separator is used in order to （）.