A.Safety valves
B.Water tubes
C.Steam stop valves
D.Blow down valves
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A.water-tube
B.fire-tube
C.exhaust gas
D.None of the above is true
A.water-tube
B.fire-tube
C.exhaust gas
D.none of the above
A.scaled
B.informed
C.leaky
D.deformed
A.sealed
B.cracked
C.shape changed
D.deformed
A.deformed
B.rusted
C.cracked
D.scaled
最新試題
Low compressor head pressure in a refrigeration system can be caused by（）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
Which of the listed pumps is NOT a positive displacement pump?（）
Thermostatic expansion valves can be adjusted for （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
Which of the following statements is correct concerning heat transfer?（）
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.