Maximum horsepower of a diesel engine is attained （）.<br>A:when the engine RPM is pulled down by overload<br>B:at rated engine RPM<br>C:at 95 % of rated engine RPM<br>D:at 95 % of a properly adjusted governor RPM with the engine under full load

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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