Medium speed engines have a （） power to weight ratio than the slow speed two strokes, but due to the higher speeds tend to have （） maintenance intervals.<br>A:higher；reduced<br>B:higher；increased<br>C:lower；reduced<br>D:lower；increased

Medium speed engines have a （） power to weight ratio than the slow speed two strokes, but due to the higher speeds tend to have （） maintenance intervals.
A:higher；reduced
B:higher；increased
C:lower；reduced
D:lower；increased

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