The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the （）<br>A:method of supplying air<br>B:cooling system<br>C:method of igniting fuel<br>D:valve operating mechanism

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

出自：海船船员证

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