Low compression pressure in a diesel engine is caused by（）

A . below B . above C . equal to D . much larger tha

A . cutout B . controller switch C . pressure controller D . cutout switch

A . an electric system manager B . a sensing bulb at the tail coil of the evaporator C . pressure changes in the suction line D . failure of the king solenoid valve

A . Reciprocating pumps B . Rotary pumps C . Centrifugal pumps D . Gear pum

A . 仅说明相应液压系统到副翼、升降舵、方向舵相应的液压出现低压 B . 仅说明相应液压系统到方向舵的油路出现低压。将电门放置在STAND BY RUD位时，当备用方向舵关断活门打开时灯灭 C . 相应液压系统到副翼、升降舵、方向舵相应的液压出现低压。将电门放置在STAND BY RUD位时，当备用方向舵关断活门打开时灯灭 D . 相应液压系统到副翼、升降舵、方向舵相应的液压出现低压。将电门放置在STAND BY RUD位时，当备用方向舵关断活门打开时灯亮

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

A . A、要求机组关掉APU B . B、可以继续使用APU，但不能使用APU引气 C . C、要求机组将APU电门放到”OFF”位后，再放到”START”位1-2秒松手 D . D、APU自动关车

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

A . A、APU电门放在”ON”位而APU还没有工作时 B . B、APU关车后 C . C、APU起动期间滑油压力上升到正常之前 D . D、任何时候亮都是不正常的

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

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

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

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

A . worn or broken cylinder liner sealing rings B . high cooling water temperature C . worn or broken piston rings D . low fuel oil pressure

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

A．omission B．combination C．addition D．obverse