单选题The term medium speed diesel engine is currently taken to mean an engine with an operating rotational speed of （） rpm.Abelow 300Babove 1200Cbetween 300 to 1200Dbelow 1200
单选题
The term medium speed diesel engine is currently taken to mean an engine with an operating rotational speed of （） rpm.
A
below 300
B
above 1200
C
between 300 to 1200
D
below 1200
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