單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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