A.they are more heavily built
B.the fuel used is less volatile
C.they can be easily reversed
D.they operate at a lower speed
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A.Oil level
B.Flow of cooling water
C.Exhaust discharge
D.All of the above
A.Four-stroke
B.Two-stroke
C.Electronic ignition
D.Forced exhaust
A.four cycle
B.compression ignition
C.vacuum ignition
D.external combustion
A.bigger propeller
B.smaller power weight ratio
C.smaller propeller
D.larger power weight ratio
A.displacement
B.stability
C.towrope pull
D.propeller design
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