单选题（） can be found on most medium to large merchant vessels even if the main engine is either a steam turbine or 2-stroke crosshead engine.AThe medium speed 4-stroke trunk piston engineBThe low speed 2-stroke crosshead engineCThe medium speed 2-stroke crosshead engineDThe low speed 4-stroke trunk piston engine
单选题
（） can be found on most medium to large merchant vessels even if the main engine is either a steam turbine or 2-stroke crosshead engine.
A
The medium speed 4-stroke trunk piston engine
B
The low speed 2-stroke crosshead engine
C
The medium speed 2-stroke crosshead engine
D
The low speed 4-stroke trunk piston engine
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