单项选择题
In （） pump a closed discharge valve will not cause excessive pressure to build up.
A.gear
B.vane
C.screw
D.centrifugal
点击查看答案&解析
相关考题
-
单项选择题
Centrifugal pumps are non-positive and a fairly （） unit.
A.low pressure
B.low discharge
C.low speed
D.high pressure -
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 -
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
