单选题On what do you depend having the air cooler of main engine chemically washed?（）Aincreased air pressure differenced before and aft air coolerBreduced exhaust temperature in all cylindersCreduced temperature difference between water inlet and outletDboth A and C
单选题
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
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