单项选择题X 纠错
A.low water level
B.low oil pressure
C.excessively high fuel pressure
D.an improper air/fuel ratio
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单项选择题
A.Reciprocating pump
B.Screw pump
C.Diffuser pump
D.Water-ring pump
单项选择题
A.discharge is continuous
B.it has no internal valves
C.upon accidental closing of discharge valve, excessive pressure will not build up
D.all of the above are true
单项选择题
A.between the suction and discharge
B.below the liquid supply
C.above the liquid supply
D.any of the above
单项选择题
A.（1）only
B.（1）and（2）
C.（1），（2）and（3）
D.（2）and（3）
单项选择题
A.（1）only
B.（1）and（2）
C.（1），（2）and（3）
D.（2）and（3）
单项选择题
A.increased；decreased
B.decreased；increased
C.decreased；decreased
D.increased；increased
单项选择题
A.kg
B.MPa
C.mH20
D.None of the above
单项选择题
A.(1), (2) and (3)
B.(1), (2) and (4)
C.(2), (3) and (4)
D.None of the above
单项选择题
A.variable stroke pumps
B.multistage pumps
C.positive displacement pumps
D.triple-ported pumps
单项选择题
A.mixed-flow pump
B.axial-flow pump
C.centrifugal pump
D.displacement pump
