The crankcases of many diesel engines are kept under a slight vacuum to （）<br>A:improve fuel economy<br>B:increase the air charge velocity<br>C:reduce the risk of explosion<br>D:all of the above

The crankcases of many diesel engines are kept under a slight vacuum to （）
A:improve fuel economy
B:increase the air charge velocity
C:reduce the risk of explosion
D:all of the above

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