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
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相关考题
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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 -
单项选择题
The mode of control employed by an alarm circuit is a （）
A.two position control
B.signal speed floating control
C.proportional speed floating control
D.reset control
