单项选择题

Internal combustion engine crankcase vent outlets must be equipped with （）

A.hinged rain guards
B.corrosion resistant flame screens
C.dipsticks for measuring oil levels
D.crankcase ventilation fans

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单项选择题

The interior of some diesel engine saltwater heat exchangers are protected from corrosion by the use of（）

A.aluminum plates
B.lead cathodes
C.copper baffle plates
D.sacrificial zincs

单项选择题

Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because （）

A.bearing pressure in a four-stroke\cycle acting single diesel engine is continually reversed
B.bearing pressure in a two-stroke\cycle single acting diesel engine is continually reversed
C.the maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engine
D.two-stoke/cycle diesel engines require more complicated lubrication piping

单项选择题

Which of the fuel injection systems listed uses a spring loaded differential spray needle valve and individual pump for each cylinder?（）

A.Common-rail injection
B.Air injection
C.Jerk pump injection
D.Distribution injection