單項(xiàng)選擇題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


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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題The meat box temperature control circuit, as used in ship service refrigeration system, is an example of （）

A.two position control
B.signal speed floating control
C.proportional control
D.reset control

4.單項(xiàng)選擇題The two most common gases used in pneumatic system are （）

A.compressed air and nitrogen
B.helium and nitrogen
C.oxygen and hydrogen
D.oxygen and acetylene

5.單項(xiàng)選擇題Restrictions occurring in the small orifices of pneumatic control system components can be used by （）

A.moisture in the compressed air supply
B.excessive dryness in the compressed air supply
C.pressure surging in the compressed air receiver
D.insufficient lubrication of the system components