单选题The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the （）Amethod of supplying airBcooling systemCmethod of igniting fuelDvalve operating mechanism
单选题
The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the （）
A
method of supplying air
B
cooling system
C
method of igniting fuel
D
valve operating mechanism
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