Low compression in a diesel engine could be caused by（）

A . seal the space between the piston and liner B . transmit heat from the piston to the cylinder liner C . reduce the amount of combustion gas blow-by D . all of the above

A . warmer，less dense，and less stable B . cool，more dense，and drier C . muggy and cloudy D . extremely moist with high relative humidity

A . clockwise direction B . northeasterly direction C . northerly direction D . counterclockwise directio

A . improved cold weather starting B . excessive fuel oil consumption C . reduced ignition lag D . smoother engine operatio

A . a worn cylinder B . broken piston rings C . either A or B D . none of the above

A . compressor；condenser B . condenser；evaporator C . throttle valve；evaporator D . evaporator；condenser

A . a leaking fuel injection nozzle B . a clogged air filter C . early fuel injection D . burned valve

A . low water in the expansion tank B . improperly seated valves C . low fuel oil pressure D . worn or broken cylinder liner sealing ring

A . a leaking fuel injector nozzle B . a clogged air filter C . excessively early fuel injection D . malfunctioning valve

A . the cylinder head B . the cross-head C . the moving piston D . the stationary pisto

A . Pressure and temperature decrease B . Pressure and temperature increase C . Pressure decreases and temperature increases D . Pressure increases and temperature decrease

A . You are backing up to tape and your tape device performs its own compression. B . You are making image copies, and you have not enabled tablespace compression. C . You are using disk-based backups and disk space in your Flash Recovery Area, or other disk-based backup destinations are limited. D . You are performing your backups to some device over a network where reduced network bandwidth is more important than CPU usage. E . You are using some archival backup media, such as CD or DVD, where reducing backup sizes saves media costs and archival storage.

A . a leaking fuel injector nozzle B . a clogged air filter C . excessively early fuel injection D . malfunctioning valve

A . increased horsepower B . reduced efficiency C . increased heat loss D . lower cylinder pressure

A . clogged coolant passages B . a leaking cylinder head gasket C . low fuel oil pressure D . worn or broken cylinder liner sealing ring

A . (1) and (2) B . (1) only C . (2) only D . (1),(2) and (3)

A . evaporator B . compressor C . expansion valve D . condenser

A . Cisco Proprietary payload compression B . Predictor payload compression C . RTP header compression D . TCP header compressio

A . evaporator B . condenser C . expansion valve D . compressor

A . improperly seating intake valves B . leaking cylinder liner seal rings C . late fuel injection timing D . carbon deposits on the pisto

A.improperly seating intake valves B.leaking cylinder liner seal rings C.late fuel injection timing D.carbon deposits on the piston

A.① and ② B.② and ③ C.① ② and ③

A.low water in the expansion tank B.improperly seated valves C.low fuel oil pressure D.worn or broken cylinder liner sealing rings