Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?（）

[单选题]Which of the following problems can occur if you continually fail to drain off condensate from a starting air receiver?A．Corrosion and eventual failure of the tankB．Gumming of the tank relief valvesC．Immediate failure of components downstream of the

[单选题]Which of the following problems is the main source of fuel pump and injection system malfunctions?A．Improper lubricationB．Air in the fuel systemC．Coated fuel linesD．Excessive vibration

[单选题]Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?A．A shortage of liquid refrigerant.B．Excessive frost on the evaporator.C．Excessive condenser cooling water.D．Insufficien

[单选题]Which of the following problems should be taken when cleaning the air filter on a diesel engine equipped with a turbocharger? .A．Reduce engine speed to idle before removing the filterB．Soak the dirty filter in kerosene onlyC．Blow out the air inlet wi

[单选题]Which of the following problems may occur if the opening pressure of a fuel injection nozzle is greater than specified by the engine manufacturer?（）A . The amount of fuel injected will be increasedB . The start of injection will be retardedC . The no

[单选题]Which of the following can be a disadvantage of search agents?A． Lack of counseling.B． Limited number of visits.C． Lower efficiency. D Fewer successful matches.

[单选题]Which of the following statements can best be inferred from the passage?A． Fishes only "speak" to communicate with each other.B． Researches are now being made to study the significance of fish sounds.C． Sea animals have a sharper hearing ability th

[单选题] Which of the following elements can be called the key element of a computer?（71）（71）A．printerB．CPUC．mouseD．keyboard

[单选题]Which of the following can best explain Judy Garland’s words?A． Be your true self rather than follow others.B． Don’t copy others or you can’t be the first class.C． Make efforts to be the first instead of the second.D． Don’t learn from others unless t

[单选题]Which of the following can be the best title of this text?A． Why do I read?B． How do I read?C． What do I read?D． When do I read?