單項(xiàng)選擇題The reciprocating pump can’t draw water from a tank may be caused by ().

A.leaky pipe
B.opened inlet valve
C.too much water in tank
D.None of the above


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1.單項(xiàng)選擇題()sometimes called filter, is a device designed to prevent the passage of unwanted solids into the system.

A.Steam trap
B.Check valve
C.Separator
D.Strainer

2.單項(xiàng)選擇題Hydraulic pumps most commonly used in steering systems are of the ().

A.lobe type
B.screw type
C.axial piston type
D.volute type

3.單項(xiàng)選擇題When an auxiliary boiler is panting and emitting black smoke, you should ().

A.increase the fuel oil temperature
B.decrease the fuel oil temperature
C.decrease the fuel oil supply pressure
D.increase the air supply

4.單項(xiàng)選擇題Close the ().

A.keyway
B.shaft
C.packing
D.valve

5.單項(xiàng)選擇題Which pump is the self-priming pump?()

A.turbine
B.centrifugal
C.ejector
D.mixed flow