Which of the following may be the disadvantages of road transport？（ ）

[多选题]Which of the following may be the disadvantages of road transport？（ ）A.Tran

[多选题]Which of the following may be the disadvantages of rail transport？（ ）A.Subj

[多选题]Which of the following may be the disadvantages of rail transport？（ ）A.Subj

[单选题]Which of the following may cause that an engine doesnt run on starting air?（）A . too low starting air pressureB . main start valve closedC . neither A nor BD . A and B

[单选题]Which of the following firing order may be used for a 6-cylinder engine? ( )A．1-2-3-4-5-6B．1-2-3-6-5-4C．1-5-3-6-2-4D．1-3-4-5-6-2

[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 conditions may need to be reduced when operating a large, low speed, main propulsion, diesel engine at low loads?（）A . Injection pressuresB . Control air supply pressureC . Cooling water flow through after-coolersD . Lube oil t

[单选题]Which of the following may take place if the clearance of the main bearings are excessive?（）A . bearing knocksB . dropping of pressure of LOC . noisesD . all the above

[单选题]Which of the following firing order may be used for an 6 cylinder engine?（）A . 1-2-3-4-5-6B . 1-2-3-6-5-4C . 1-5-3-6-2-4D . 1-3-4-5-6-2

[单选题]Which of the following may lead to the engine NOT to start on air?（）A . starting air pressure too highB . correct timing of starting air valvesC . three of the six starting valves stuckD . the turning gear disengaged