问题：
[单选] Which of the following will take place if the clearance of the main bearings are excessive?（）
bearing knocks。dropping of pressure of LO。noises。all the above。
问题：
[单选] Which of the following would cause a diesel to have black smoke?（）
leaky injector。water in the gas。too heavy oil。water in the oil。
问题：
[单选] While engine is in operation the piston moves up and down, thus causing the rotation of the （）.
crankcase。slipper。cam housing。crankshaft。
问题：
[单选] Whilst the engine is turning, check to see that no water is leaking into the crankcase, scavenge air belt, or from （）.
exhaust valves。starting valves。fuel valves。the indicator cock。
问题：
[单选] With supercharging a larger mass of air is supplied to the cylinder by blowing it in under pressure, which is the best means to （） of the engine.
increase the exhaust temperature。increase the power of。reduce the speed。increase the fuel consumptio。
问题：
[单选] With （） unit the timing of fuel injection of an engine can be regulated automatically.
MBT。MEG。VSG。VIT。
问题：
[单选] With four-stroke engines, it takes four revolutions of the crank shaft to make （） power stroke(s).
1。2。4。8。
问题：
[单选] With the crank in position in the engine, some measurements can be taken by a special bridge gauge and （）.
a micrometer。a bowl。a feeler gauge。a wrench。
问题：
[单选] With the shell and cap assembled as for running, a check must be made that the clearance between the cap and the housing （）.
has a nip。is large enough。is zero。are suitable。
问题：
[单选] With VIT the start of injection may be （） as the engine load is reduced within a certain range.
advanced。retarded。relayed。cut off。
