单选题A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a （）.Aslow-speed dieselBmedium-speed dieselChigh-speed dieselDconstant-speed diesel
单选题
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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