单项选择题
In order to accurately measure very low pressures, which of the instruments listed should be used?（）
A.Compound gage
B.Bonrdon tube
C.Manometer
D.Deadweight gage
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相关考题
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单项选择题
Reduced capacity, accompanied by vibration and noise at the suction of a centrifugal pump is a result of （）.
A.cavitation
B.water hammer
C.fluid friction
D.steam knock -
单项选择题
The refrigerant leaves the evaporator of a refrigeration system as a low pressure （）.
A.sub-cooled liquid
B.high temperature liquid
C.oil saturated liquid
D.superheated vapor -
单项选择题
When operating with a negative suction head, which of the following types of pumps will require priming?（）
A.Reciprocating
B.Centrifugal
C.Rotary
D.Gear
