A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a （）.<br>A:slow-speed diesel<br>B:medium-speed diesel<br>C:high-speed diesel<br>D:constant-speed diesel

A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a （）.
A:slow-speed diesel
B:medium-speed diesel
C:high-speed diesel
D:constant-speed diesel

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