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

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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