单选题With reference to an axial piston pump, which one of the following statements is true?（）AThe cylindrical barrel is coupled to the motorBThe cylindrical barrel has an odd number of boresCThe bores end in socketsDThe sockets fit in the swash plate
单选题
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
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The usual number of single-acting pistons used in a variable stroke axial-piston pump isA.3 or 5B.5 or 7C.7 or 9D.9 or 11
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