Either a low injection pressure or a leakage of piston rings is able to lead （）.

[单选题]The high pressure in fuel injection system of the diesel engine is produced by the （）.A . injector pumpB . fuel injectorC . governorD . turbocharger

[单选题]Low compressor head pressure in a refrigeration system can be caused by ___.A．insufficient condenser cooling waterB．excessive condenser cooling waterC．air in the refrigeration systemD．excessive refrigerant in the system

[名词解释] 低压安全注射系统﹝压水堆﹞ low head safety injection system

[单选题]APU工作期间，“APU LOW OIL PRESSURE”灯亮：（）.A .要求机组关掉APUB .可以继续使用APU，但不能使用APU引气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 .APU自动关车

[单选题]APU LOW OIL PRESSURE”灯何时亮是正常的（）？A .APU电门放在”ON”位而APU还没有工作时B .APU关车后C .APU起动期间滑油压力上升到正常之前D .任何时候亮都是不正常的

[判断题] LEA有效地址送寄存器指令格式为：LEA REG，SRC。A . 正确B . 错误

[单选题]B．ecause the timing of injection is crucial, _____ mounted on the camshaft, which is driven by the crankshaft are used to operate the fuel pumps, one of which is provided for each cylinder.A．gearsB．ramsC．barrelsD．cams

[单选题]With VIT the start of injection may be （） as the engine load is reduced within a certain range.A . advancedB . retardedC . relayedD . cut off

[单选题]There is an injection pump for each cylinder, which is usually operated once every cycle by （） on the camshaft.A . a gearB . a camC . a rodD . a miler

[单选题]The sequence of fuel injection into cylinders is determined by （）.A . the steeringB . the driven gearC . the turning gearD . the timing gear