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
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相关考题
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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 -
单项选择题
According to the way the steering gear is operated, the steering gear may be divided into: hand - steering, （） and automatic steering.
A.hydraulic steering
B.follow-up steering
C.remote control steering
D.air controlled steering
