The usual number of single-acting pistons used in a variable stroke axial-piston pump is （）.<br>A:3 or 5<br>B:5 or 7<br>C:7 or 9<br>D:9 or 11

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

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