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（） 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

时间：2022-01-10 05:06 关键词： 船舶电气与船舶安全

答案解析

A