单项选择题
A.low pressure B.low discharge C.low speed D.high pressure
Gear pumps are （） type because they discharge a near co...
单项选择题Gear pumps are （） type because they discharge a near constant amount of liquid regardless of pressure.
A.positive displacement B.non-positive displacement C.mixed-flow D.axial-flow
（） are more suitable for large quantities at low pressu...
单项选择题（） are more suitable for large quantities at low pressure.
A.Reciprocating pumps B.Rotary pumps C.Centrifugal pumps D.Gear pumps
The various pumps and lines are （） to some extent so th...
单项选择题The various pumps and lines are （） to some extent so that each pump can act as an alternative for another.
A.interlocked B.interconnected C.interfered D.interacted
