单选题The （） engine is used for alternators and some times for main propulsion with a gearbox to provide a propeller of between 90 to 120 rpm.Afour-strokeBtwo-strokeCslow speedDreversible
单选题
The （） engine is used for alternators and some times for main propulsion with a gearbox to provide a propeller of between 90 to 120 rpm.
A
four-stroke
B
two-stroke
C
slow speed
D
reversible
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