The term medium speed diesel engine is currently taken to mean an engine with an operating rotational speed of （） rpm.<br>A:below 300<br>B:above 1200<br>C:between 300 to 1200<br>D:below 1200

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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