A.reciprocating pumps
B.positive displacement pumps
C.centrifugal pumps
D.centripetal pumps
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A.depending on
B.in relative to
C.regardless of
D.because of
A.variable stroke pumps
B.multistage pumps
C.positive displacement pumps
D.triple-ported pumps
A.positive displacement
B.ejector
C.centrifugal
D.air compressor
A.reciprocating pump
B.positive displacement pump
C.centrifugal pump
D.centripetal pump
最新試題
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
A salinity indicator is used to determine the （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.