The main purpose of warming the parts of the main engine is （）<br>A:to reduce heat stress<br>B:to reduce low temperature corrosion<br>C:to improve firing and starting performance<br>D:fuel saving

The main purpose of warming the parts of the main engine is （）
A:to reduce heat stress
B:to reduce low temperature corrosion
C:to improve firing and starting performance
D:fuel saving

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