问题：
[单选] The distance from TDC to BDC of the diesel engine is called （）.
gap。clearance。radius。stroke。
问题：
[单选] The efficiency of turbocharge system is increased by fitting a charge air cooler （） the compressor.
inside。before。after。against。
问题：
[单选] The energy for pushing this piston up can be supplied from （）, so that the piston can keep moving up and down.
the same piston。the piston nearby。the other pistons。the generators on board。
问题：
[单选] The engine has one or two group of fuel pumps, depending upon （）.
the number of fuel valves。the number of cylinders。the speed of engine。the power of engine。
问题：
[单选] The engine is reversed by axial displacement of the camshafts In order for this to be carried out, the cams are （） with inclined transition faces.
lathed。shaped。shrunk。developed。
问题：
[单选] The engine is started with （） supplied from air receivers.
pressure oil。pressure water。compressed air。cooling water。
问题：
[单选] The engine may lose power or slow down during running, when this occurs, the first cause possible may be hot bearings and （） of the pistons in the cylinders.
crack。knocking。leaking。seizure。
问题：
[单选] “The engine not obtaining the sufficient speed for firing” means that （）.
the start fails。the fuel pumps will be put into operation。the fuel valves are damaged。the combustion process will take over。
问题：
[单选] The engine will fail to start unless （）.
the pressure of the starting air is high enough。there is enough air in the air reservoirs。the air is supplied into the cylinders in the appropriate sequence。all of the above。
问题：
[单选] The exhaust gases for a new engine should be （） when the engine operates under full load.
smoky。a little bit dense。visible。almost invisible。
