A.shaft and impeller
B.motor and pump shaft
C.casing and impeller wearing rings
D.lantern ring and impeller
您可能感興趣的試卷
你可能感興趣的試題
A.central valve
B.radial plunger
C.floating ring
D.cylinder body
A.moisturizing
B.dehumidification
C.dampening
D.humidification
A.compressor is overloaded
B.motor is overloaded
C.foundation bolts are loose
D.belts are too tight
A.rapidly
B.by gravity
C.through a standard orifice at a specified temperature
D.at a rate of 60cc per second
A.flooding back
B.superheating
C.overflowing
D.recycling
最新試題
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
A salinity indicator is used to determine the （）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
When the steering gear is in operation, you should （）.
The general purpose of a heat exchanger is to （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）