The amount of fluid delivered by a helical
题型:单项选择题
问题:
The amount of fluid delivered by a helical pump can be regulated by ().
A.throttling the pressure line
B.changing the speed of the rotor
C.either A or B
D.None of the above is tree
The amount of fluid delivered by a helical pump can be regulated by ().
A.throttling the pressure line
B.changing the speed of the rotor
C.either A or B
D.None of the above is tree