单项选择题
Which of the following statements is correct concerning the viscosity of lubricating oil?（）
A.Viscosity will increase as temperature increases
B.Viscosity is a measure of a fluid s internal resistance to flow
C.Viscosity will decrease as temperature decreases
D.Viscosity is not dependent on temperature
点击查看答案&解析
相关考题
-
单项选择题
Under normal operating conditions, the rudder is hydraulically locked unless （）.
A.the manual trick wheel is engaged for steering
B.the variable stroke pump is off stroke
C.a rudder order is given by the control system
D.an electric power system failure occurs at the steering gear -
单项选择题
Saltwater is typically provided to a refrigeration system to （）.
A.cool the expansion valve
B.prevent refrigerant superheating
C.condense the refrigerant gas
D.prevent motor overheating -
单项选择题
Which of the listed operations will cause an automatically controlled refrigeration compressor to restart?（）
A.Closing of the solenoid valve
B.Closing of the expansion valve
C.An increase in the suction pressure
D.Decreasing the suction pressure
