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
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相关考题
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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 -
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
