單項(xiàng)選擇題

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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單項(xiàng)選擇題

With reference to an axial piston pump, which one of the following statements is true?（）

A.The cylindrical barrel is coupled to the motor
B.The cylindrical barrel has an odd number of bores
C.The bores end in sockets
D.The sockets fit in the swash plate

單項(xiàng)選擇題

With reference to a two ram actuating mechanism, which one of the following statement is false?（）

A.The rams work inside cylinders
B.The cylinders have glands sealing their open ends
C.The rams are connected to a cross-head
D.The cross-head is mounted on the rudder stock

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