单选题Which of the following statements describes the function of an expansion tank in a diesel engine cooling system?（）AMaintains a constant head on the systemBReduces the likelihood of air or steam pockets formationCProvides a low pressure point for the addition of makeup cooling waterDAll of the above
单选题
Which of the following statements describes the function of an expansion tank in a diesel engine cooling system?（）
A
Maintains a constant head on the system
B
Reduces the likelihood of air or steam pockets formation
C
Provides a low pressure point for the addition of makeup cooling water
D
All of the above
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