单项选择题
In a flash type evaporator, all saltwater headers are vented through individual vent cocks to the（）.
A.saltwater heater shell
B.second-stage condenser
C.atmosphere
D.second-stage flash chamber
相关考题
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单项选择题
Which of the listed characteristics of lube oil are the most important to the engineer from an operational standpoint?（）
A.Ash content, carbon residue, and gravity
B.Viscosity, acidity, and demulsibility
C.Pour point, flash, point, and precipitation number
D.Auto-ignition point, viscosity index, and film strength -
单项选择题
Which of the following statements describes the function of an air compressor intake filter?（）
A.Protects against suction valve float
B.Provides a positive pressure on the air inlet valves
C.Prevents lubricating oil contamination of the compressed air supply
D.Protects against the damaging effects of airborne solid particles -
单项选择题
Hydraulic cranes must be properly warmed-up before being operated because （）.
A.warm-up allows the hydraulic system to become charged with oil
B.warm-up allows the relief valves to be properly tested
C.hydraulic strainers operate only during the warm-up period
D.hydraulic fluid must be at the proper viscosity
