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
单项选择题 Directional intake ports in diesel engines are used to （）.
单项选择题 Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of （）.
单项选择题 Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished （）.
