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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A.Common-rail injection
B.Air injection
C.Jerk pump injection
D.Distribution injection
A.two position control
B.signal speed floating control
C.proportional speed floating control
D.reset control
A.two position control
B.signal speed floating control
C.proportional control
D.reset control
A.compressed air and nitrogen
B.helium and nitrogen
C.oxygen and hydrogen
D.oxygen and acetylene
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
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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
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To proceed to the assistance of a ship in distress is（）
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（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.
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