On what do you depend having the air cooler of main engine chemically washed?（）<br>A:increased air pressure differenced before and aft air cooler<br>B:reduced exhaust temperature in all cylinders<br>C:reduced temperature difference between water inlet and outlet<br>D:both A and C

On what do you depend having the air cooler of main engine chemically washed?（）
A:increased air pressure differenced before and aft air cooler
B:reduced exhaust temperature in all cylinders
C:reduced temperature difference between water inlet and outlet
D:both A and C

出自：海船船员证

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