The usual number of single-acting pistons
题型:单项选择题
问题:
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
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