Regarding a Diesel engine crankcase, the general arrangement and installation should preclude the possibility of （）
1、In a two-stroke/cycle diesel engine, t
In a two-stroke/cycle diesel engine, the exhaust gases are expelled from the cylinder by the（）Aexhaust manifoldBvalve bridgeCpressure of the fresh air chargeDvalve adjusting gear
2、In a four-stroke cycle diesel engine t
In a four-stroke cycle diesel engine the intake valves open （）Abefore TDC and close after BDCBafter TDC and close after BDCCbefore TDC and close before BDCDafter TDC and close before BDC
3、A diesel engine crankcase ventilation
A diesel engine crankcase ventilation system （）Aprevents spark generationBremoves combustible gasesCdetermines the level of combustible gasesDprovides inert gas generation in crankcase
4、The crankcase of many diesel engines a
The crankcase of many diesel engines are kept under a slight vacuum by the （）.Ascavenging action of the pistonBpiston type vacuum pump taking suction off a differential manometerCgland exhausting manometerDcrankcase exhaust fa
5、Diesel engines obtain combustion air t
Diesel engines obtain combustion air through turbo chargers，blowers，or（）.Aair startersBcarburetorsCnatural aspirationDair receiver
6、A diesel engines crankcase oil level i
A diesel engines crankcase oil level is found to be too high√ You should suspect that （）.Athe engine was over filledBthere might be a fuel leakCthere might be a water leakDall of the above