The usual number of single-acting pistons used in
The usual number of single-acting pistons used in a variable stroke axial-piston pump is
A.3 or 5
B.5 or 7
C.7 or 9
D.9 or 11
请帮忙给出正确答案和分析，谢谢！
参考解答
457***779
2024-06-14 19:06:16
正确答案：C
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