When the opening pressure of a diesel engine fuel injector is greater than that specified by the engine manufacturer, which of the following problems can be expected?（）
1、The color of the exhaust from a diesel
The color of the exhaust from a diesel engine should be （）AclearBhazy light brownChazy light blueDhazy light grey
2、If the firing pressures in a diesel en
If the firing pressures in a diesel engine are high, although the exhaust temperatures are normal, the cause may be（）Aearly injection timingBw...
3、If the head pressure of a reciprocatin
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.Athe relief valve should open before the high pressure cutout...
4、The pressure of a liquid leaving the p
The pressure of a liquid leaving the pump can be referred to as the （）.Atotal headBdischarge headCnet positive suction headDsuction head
5、A pressure drop in the liquid line of
A pressure drop in the liquid line of a refrigeration system may cause（）Athe solenoid valve to seizeBthe compressor to huntCflash gas to form in the liquid lineDthe expansion valve to freeze ope
6、The highest pressure in a diesel engin
The highest pressure in a diesel engine cylinder normally occurs （）.Aat TDCBbefore TDCCafter TDCDduring air starting