单选题Maximum horsepower of a diesel engine is attained （）.Awhen the engine RPM is pulled down by overloadBat rated engine RPMCat 95 % of rated engine RPMDat 95 % of a properly adjusted governor RPM with the engine under full load
单选题
Maximum horsepower of a diesel engine is attained （）.
A
when the engine RPM is pulled down by overload
B
at rated engine RPM
C
at 95 % of rated engine RPM
D
at 95 % of a properly adjusted governor RPM with the engine under full load
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