The size of the exhaust valve opening is （）
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、The needle valve will open when the fu
The needle valve will open when the fuel pressure acting on the needle valve （） exerts a sufficient force to overcome the spring compression.Atape faceBtapered faceCsurfaceDthinner face
3、The normal color of the exhaust gas of
The normal color of the exhaust gas of the diesel will be （）Aachromatism or thin grayBthin whiteCsky-blueDblack
4、The purpose of the purge valve at the
The purpose of the purge valve at the top of the condenser in a refrigerating system is to（）Aremove any air that may accumulate in the sys...
5、The exhaust valve opens before bottom
The exhaust valve opens before bottom dead center in a four stroke engine to（）Ⅰ.allow for blow downⅡ.Reduce pumping lossesAⅠ onlyBⅡ onlyCboth Ⅰ and ⅡDneither Ⅰ nor Ⅱ
6、The size of the discharge ring used fo
The size of the discharge ring used for the efficient operation of a disk type purifier is dependent upon the（）Arated capacity of that purif...