单项选择题
Fuel is admitted to a diesel engine cylinder through the （）.
A.intake valves
B.carburetor
C.exhaust ports
D.injector nozzles
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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 -
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
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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
