Operating a propulsion diesel engine at less than 30% of designed normal load for prolonged periods will result in （）.<br>A:decreased fuel consumption per brake horsepower<br>B:more complete cylinder scavenging<br>C:extended valve life<br>D:carbon formation on combustion chamber surfaces

Operating a propulsion diesel engine at less than 30% of designed normal load for prolonged periods will result in （）.
A:decreased fuel consumption per brake horsepower
B:more complete cylinder scavenging
C:extended valve life
D:carbon formation on combustion chamber surfaces

出自：海船船员证

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