单选题The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.Areduce water temperatureBreduce water turbulenceCprovide an air cushionDallow for an increase in water volume as the engine warms up
单选题
The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.
A
reduce water temperature
B
reduce water turbulence
C
provide an air cushion
D
allow for an increase in water volume as the engine warms up
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