单项选择题
A.intake valves B.carburetor C.exhaust ports D.injector nozzles
Diesel engine main and connecting rod precision bearing...
单项选择题Diesel engine main and connecting rod precision bearings are made in halvesEach half exceeds one-half the bearing circumference by a small amountThe small amount is termed （）.
A.clearance B.crush C.pitch D.thrust
If an operating auxiliary boiler has a water pH reading...
单项选择题If an operating auxiliary boiler has a water pH reading of 7, you should （）.
A.bottom blow the boiler B.treat the water with caustic soda C.treat the water with chemical scavengers D.reduce the water alkalinity to recommended readings
Generating tubes in waste heat boilers are finned to （）...
单项选择题Generating tubes in waste heat boilers are finned to （）.
A.reduce gas flow turbulence B.prevent exhaust gas corrosion C.increase the rate of combustion D.increase the rate of heat transfer
